Quick Answer
SAT observational studies and experiments practice questions test whether students can distinguish association from causation, identify treatments and response variables, evaluate random assignment, interpret control groups and placebos, recognize confounding, and determine when results can be generalized. This guide includes 70 SAT-style questions that progress from basic study design to blocking, matched pairs, blinding, ethical limits, and harder inference scenarios.
What Should You Know Before Practicing Observational Studies and Experiments?
- Observational studies observe existing behavior without imposing treatments.
- Experiments impose treatments on experimental units.
- Random assignment supports causal conclusions.
- Random sampling supports generalization to a population.
- Control groups, placebos, and blinding reduce alternative explanations.
- Confounding occurs when treatment effects cannot be separated from another variable.
- Association does not automatically imply causation.
In This Guide – 70 SAT Observational Studies and Experiments Practice Questions
Start With SAT Math Topic-Wise Practice
Connect study-design practice with weekly score planning, mock-test review, and targeted SAT Math correction.
Download the SAT Prep Guide E-Book
Use the SAT Prep Guide E-Book to organize observational study, experiment, sampling, and data-analysis practice with a clear weekly score improvement plan.
Download SAT Prep E-Book Guide Download SAT Prep E-book GuideWhat Does the SAT Test in Observational Studies and Experiments?
Students may need to identify the study type, locate explanatory and response variables, evaluate confounding, distinguish random sampling from random assignment, or decide whether a causal or population conclusion is justified.
| Skill Area | What It Tests | Questions |
|---|---|---|
| Study basics | Study type, variables, association, causation, confounding | Q1-Q15 |
| Experimental design | Random assignment, control, placebo, blinding, replication, blocking | Q16-Q30 |
| Inference | Causation, generalization, internal and external validity | Q31-Q45 |
| Advanced design | Matched pairs, order effects, ethics, prospective and retrospective studies | Q46-Q70 |
Download Free SAT Study Resources For U.S. Students
To begin your preparation with organized practice, download our free SAT Prep E-Book, SAT Math Question Bank, and SAT English Question Bank. These tools are intended to assist students in comprehending the style of the Digital SAT, increasing their accuracy, and boosting their self-assurance prior to test day.
How Are Observational Studies and Experiments Distinguished?
These questions focus on study type, explanatory and response variables, association, causation, lurking variables, and confounding.
STUDY DESIGN BASICS
EASY
Question 1
A researcher records students’ sleep hours and test scores without assigning any condition. What type of study is this?
Which choice is correct?
A) Observational study
B) Randomized experiment
C) Census
D) Matched-pairs experiment
Show full solution
Correct answer: A) Observational study
No treatment is imposed; existing behavior is observed.
SAT trap: Observation can show association but not usually causation.
STUDY DESIGN BASICS
EASY
Question 2
A researcher randomly assigns participants to two exercise programs and compares blood pressure. What type of study is this?
Which choice is correct?
A) Observational study
B) Randomized experiment
C) Voluntary-response survey
D) Census
Show full solution
Correct answer: B) Randomized experiment
The researcher imposes treatments and randomly assigns participants.
SAT trap: Random assignment is the key experimental feature.
STUDY DESIGN BASICS
EASY
Question 3
Which feature best distinguishes an experiment from an observational study?
Which choice is correct?
A) A large sample
B) A numerical response
C) Imposed treatments
D) A graph
Show full solution
Correct answer: C) Imposed treatments
Experiments impose treatments; observational studies do not.
SAT trap: Sample size does not determine study type.
STUDY DESIGN BASICS
EASY
Question 4
Which conclusion can a well-designed randomized experiment most strongly support?
Which choice is correct?
A) Causation
B) Association only
C) Population size
D) A guaranteed result for every person
Show full solution
Correct answer: A) Causation
Random assignment helps isolate the treatment effect.
SAT trap: Random assignment supports causation, not certainty for every individual.
STUDY DESIGN BASICS
EASY
Question 5
Which conclusion can an observational study usually support?
Which choice is correct?
A) Definite causation
B) Association
C) Random assignment
D) Treatment effectiveness for everyone
Show full solution
Correct answer: B) Association
Uncontrolled lurking variables may explain the relationship.
SAT trap: Association is not causation.
STUDY DESIGN BASICS
EASY
Question 6
What is the explanatory variable?
Which choice is correct?
A) The measured outcome
B) The variable used to explain or predict changes
C) The sample size
D) The margin of error
Show full solution
Correct answer: B) The variable used to explain or predict changes
It is the predictor or treatment variable.
SAT trap: Do not confuse it with the response variable.
STUDY DESIGN BASICS
EASY
Question 7
What is the response variable?
Which choice is correct?
A) The measured outcome
B) The assigned treatment only
C) The population
D) The sampling method
Show full solution
Correct answer: A) The measured outcome
It is the outcome recorded in the study.
SAT trap: The response is what the study tries to explain.
STUDY DESIGN BASICS
EASY
Question 8
A study uses study time to predict exam score. What is the response variable?
Which choice is correct?
A) Study time
B) Exam score
C) Sample size
D) Student age only
Show full solution
Correct answer: B) Exam score
Exam score is the measured outcome.
SAT trap: Read which variable is the predictor.
STUDY DESIGN BASICS
EASY
Question 9
What is a lurking variable?
Which choice is correct?
A) An unmeasured variable that may affect the relationship
B) The response variable
C) The sample mean
D) The randomization method
Show full solution
Correct answer: A) An unmeasured variable that may affect the relationship
It may help explain the observed association.
SAT trap: Unmeasured factors can weaken causal claims.
STUDY DESIGN BASICS
MEDIUM
Question 10
What is a confounding variable?
Which choice is correct?
A) A variable whose effect cannot be separated from the treatment effect
B) A variable equal to zero
C) A sample statistic
D) A random number
Show full solution
Correct answer: A) A variable whose effect cannot be separated from the treatment effect
It creates an alternative explanation for the observed result.
SAT trap: Confounding can imitate a treatment effect.
STUDY DESIGN BASICS
MEDIUM
Question 11
People who carry lighters have higher rates of lung disease. What is a likely confounding variable?
Which choice is correct?
A) Smoking
B) Height
C) Shoe size
D) Month of birth
Show full solution
Correct answer: A) Smoking
Smoking is related to both carrying lighters and lung disease.
SAT trap: The observed variable may be a proxy for another factor.
STUDY DESIGN BASICS
MEDIUM
Question 12
Which statement about correlation is correct?
Which choice is correct?
A) It proves causation
B) It describes the strength and direction of association
C) It requires random assignment
D) It cannot occur in observational studies
Show full solution
Correct answer: B) It describes the strength and direction of association
Correlation summarizes association between quantitative variables.
SAT trap: Correlation alone does not prove causation.
STUDY DESIGN BASICS
MEDIUM
Question 13
A study records screen time and sleep duration for 500 teenagers. No treatment is assigned. What is the strongest conclusion?
Which choice is correct?
A) Screen time causes less sleep
B) Screen time is associated with sleep duration
C) Less sleep causes all screen use
D) Random assignment occurred
Show full solution
Correct answer: B) Screen time is associated with sleep duration
The design is observational.
SAT trap: Use association language for observational studies.
STUDY DESIGN BASICS
MEDIUM
Question 14
What is a treatment?
Which choice is correct?
A) A condition applied to an experimental unit
B) The population
C) A sample statistic
D) The measured response only
Show full solution
Correct answer: A) A condition applied to an experimental unit
Treatments are the conditions being compared.
SAT trap: Treatments are assigned; responses are measured.
STUDY DESIGN BASICS
MEDIUM
Question 15
What is an experimental unit?
Which choice is correct?
A) A person or object receiving a treatment
B) The explanatory variable only
C) The population parameter
D) The control mean
Show full solution
Correct answer: A) A person or object receiving a treatment
Experimental units receive the treatments.
SAT trap: Human participants are experimental units in many studies.
Build Stronger SAT Data Analysis Skills
Connect study design with sampling, surveys, and real SAT Problem-Solving and Data Analysis questions.
How Is a Strong Experiment Designed?
These questions test random assignment, control groups, placebos, blinding, replication, and blocking.
EXPERIMENTAL DESIGN
MEDIUM
Question 16
Why is random assignment used in an experiment?
Which choice is correct?
A) To create equal group sizes only
B) To help balance lurking variables across groups
C) To select the population
D) To guarantee no dropout
Show full solution
Correct answer: B) To help balance lurking variables across groups
Random assignment reduces systematic group differences.
SAT trap: Random assignment is not the same as random sampling.
EXPERIMENTAL DESIGN
MEDIUM
Question 17
What is the main purpose of a control group?
Which choice is correct?
A) To provide a comparison baseline
B) To increase the treatment dose
C) To select volunteers
D) To remove the response variable
Show full solution
Correct answer: A) To provide a comparison baseline
It shows what happens without the active treatment or under standard care.
SAT trap: A control group does not always receive nothing.
EXPERIMENTAL DESIGN
MEDIUM
Question 18
What is a placebo?
Which choice is correct?
A) An inactive treatment resembling the active treatment
B) The strongest dose
C) A random sample
D) The measured outcome
Show full solution
Correct answer: A) An inactive treatment resembling the active treatment
A placebo controls for expectations and treatment experience.
SAT trap: A placebo is not an active treatment.
EXPERIMENTAL DESIGN
MEDIUM
Question 19
What is the placebo effect?
Which choice is correct?
A) A response caused by participants' expectations
B) A sampling error
C) A measurement unit
D) A cluster sample
Show full solution
Correct answer: A) A response caused by participants’ expectations
Belief in treatment may influence the response.
SAT trap: Expectations can create change without an active treatment.
EXPERIMENTAL DESIGN
MEDIUM
Question 20
In a single-blind experiment, who usually does not know the treatment assignment?
Which choice is correct?
A) Participants
B) Everyone in the population
C) Only the statistician
D) No one
Show full solution
Correct answer: A) Participants
Participants commonly do not know which treatment they receive.
SAT trap: Use the definition given in the study context.
EXPERIMENTAL DESIGN
MEDIUM
Question 21
In a double-blind experiment, who does not know assignments during the study?
Which choice is correct?
A) Participants and evaluators
B) Only the control group
C) Only the treatment group
D) The entire population
Show full solution
Correct answer: A) Participants and evaluators
Double blinding reduces expectation and evaluator bias.
SAT trap: Blinding and random assignment serve different purposes.
EXPERIMENTAL DESIGN
MEDIUM
Question 22
Why can blinding improve an experiment?
Which choice is correct?
A) It reduces expectation and measurement bias
B) It makes the sample a census
C) It increases population size
D) It guarantees significance
Show full solution
Correct answer: A) It reduces expectation and measurement bias
Knowledge of assignment can influence behavior or evaluation.
SAT trap: Blinding does not replace random assignment.
EXPERIMENTAL DESIGN
MEDIUM
Question 23
A trial compares a new tutoring app with the school’s usual program. What should the control group receive?
Which choice is correct?
A) The usual program
B) The new app plus the usual program
C) No measurement
D) A different population
Show full solution
Correct answer: A) The usual program
The standard program is a meaningful baseline.
SAT trap: A control condition depends on context.
EXPERIMENTAL DESIGN
MEDIUM
Question 24
A drug trial assigns patients using a random-number generator. Which feature is shown?
Which choice is correct?
A) Random assignment
B) Convenience sampling
C) Cluster sampling
D) Observational design
Show full solution
Correct answer: A) Random assignment
The random-number generator determines treatment groups.
SAT trap: Treatment assignment is different from participant sampling.
EXPERIMENTAL DESIGN
MEDIUM
Question 25
Students choose whether to use a new study method. What is the main problem?
Which choice is correct?
A) Self-selection may confound the comparison
B) The sample is too large
C) There is no response variable
D) The study is double-blind
Show full solution
Correct answer: A) Self-selection may confound the comparison
Students choosing the method may differ in motivation or ability.
SAT trap: Treatment choice creates systematic differences.
EXPERIMENTAL DESIGN
HARD
Question 26
Which design best reduces the influence of prior math ability?
Which choice is correct?
A) Randomly assign students to methods
B) Let students choose
C) Put all high scorers in one group
D) Survey students only
Show full solution
Correct answer: A) Randomly assign students to methods
Random assignment helps distribute prior ability across groups.
SAT trap: Systematic grouping can create confounding.
EXPERIMENTAL DESIGN
HARD
Question 27
Why is replication important?
Which choice is correct?
A) It applies treatments to enough units to assess variation
B) It removes the response variable
C) It makes all results identical
D) It converts the study to a survey
Show full solution
Correct answer: A) It applies treatments to enough units to assess variation
Replication helps separate real effects from chance variation.
SAT trap: One unit per treatment gives weak evidence.
EXPERIMENTAL DESIGN
HARD
Question 28
Which experiment has better replication?
Which choice is correct?
A) One plant per fertilizer
B) Fifty plants per fertilizer
C) One class total
D) One volunteer per treatment
Show full solution
Correct answer: B) Fifty plants per fertilizer
More units per treatment provide better information about variability.
SAT trap: Replication concerns experimental units.
EXPERIMENTAL DESIGN
HARD
Question 29
What does blocking do?
Which choice is correct?
A) Groups similar units before random assignment
B) Removes all treatments
C) Selects only volunteers
D) Guarantees equal responses
Show full solution
Correct answer: A) Groups similar units before random assignment
Blocking controls known sources of variability.
SAT trap: Random assignment still occurs within blocks.
EXPERIMENTAL DESIGN
HARD
Question 30
Students are grouped by grade and then randomly assigned within each grade. What design is used?
Which choice is correct?
A) Block design
B) Convenience sample
C) Voluntary-response design
D) Pure observational study
Show full solution
Correct answer: A) Block design
Grade is used as a block before treatment assignment.
SAT trap: Blocking is not the same as stratified sampling.
When Can Results Support Causation or Generalization?
These questions distinguish random sampling from random assignment and evaluate internal and external validity.
INFERENCE AND GENERALIZATION
HARD
Question 31
A study randomly samples city residents but assigns no treatment. What can it best support?
Which choice is correct?
A) Generalization of observed associations to city residents
B) Definite causation
C) A conclusion about every country
D) Random treatment effects
Show full solution
Correct answer: A) Generalization of observed associations to city residents
Random sampling supports generalization, but the study is observational.
SAT trap: Sampling supports scope; assignment supports causation.
INFERENCE AND GENERALIZATION
HARD
Question 32
A study uses volunteers but randomly assigns treatments. What can it best support?
Which choice is correct?
A) Causation for participants
B) Generalization to all adults
C) A citywide census
D) No treatment comparison
Show full solution
Correct answer: A) Causation for participants
Random assignment supports causation; volunteer sampling limits generalization.
SAT trap: Separate internal and external validity.
INFERENCE AND GENERALIZATION
HARD
Question 33
A study randomly samples and randomly assigns treatments. What can it support?
Which choice is correct?
A) Causation and generalization to the population
B) Association only
C) Causation but never generalization
D) Generalization but never causation
Show full solution
Correct answer: A) Causation and generalization to the population
Both forms of randomness are present.
SAT trap: Random sampling and assignment have different jobs.
INFERENCE AND GENERALIZATION
HARD
Question 34
A study neither randomly samples nor randomly assigns. What is the safest conclusion?
Which choice is correct?
A) Limited association for the observed group
B) Strong causation for the population
C) Guaranteed generalization
D) A perfect experiment
Show full solution
Correct answer: A) Limited association for the observed group
Both causal and population claims are limited.
SAT trap: A large sample does not automatically fix design flaws.
INFERENCE AND GENERALIZATION
HARD
Question 35
Which method is required for a strong causal claim?
Which choice is correct?
A) Random assignment
B) Random sampling only
C) A large population
D) A narrow margin of error
Show full solution
Correct answer: A) Random assignment
It helps isolate the treatment effect.
SAT trap: Random sampling alone does not create a fair treatment comparison.
INFERENCE AND GENERALIZATION
HARD
Question 36
Which method is most important for generalizing survey results?
Which choice is correct?
A) Random sampling
B) Placebo treatment
C) Blinding only
D) Random assignment only
Show full solution
Correct answer: A) Random sampling
A representative sample supports population inference.
SAT trap: Random assignment does not select a population sample.
INFERENCE AND GENERALIZATION
HARD
Question 37
A school randomly selects students and records existing planner use and grades. What conclusion is appropriate?
Which choice is correct?
A) Planner use is associated with grades in the school population
B) Planner use definitely causes higher grades
C) Grades cause planner use
D) Random assignment proves causation
Show full solution
Correct answer: A) Planner use is associated with grades in the school population
Random sampling supports generalization, but the design is observational.
SAT trap: Do not use causal language.
INFERENCE AND GENERALIZATION
HARD
Question 38
A company randomly assigns volunteers to standing or seated desks. What is the strongest conclusion?
Which choice is correct?
A) Desk type can cause differences for the volunteers
B) Results apply to all workers everywhere
C) The study is observational
D) No comparison is possible
Show full solution
Correct answer: A) Desk type can cause differences for the volunteers
Random assignment supports causation for participants.
SAT trap: Volunteer recruitment limits external validity.
INFERENCE AND GENERALIZATION
HARD
Question 39
A convenience sample is taken from one gym. Which population is safest to describe?
Which choice is correct?
A) The surveyed gym members
B) All adults in the country
C) All athletes worldwide
D) Every city resident
Show full solution
Correct answer: A) The surveyed gym members
The sample is most directly relevant to those observed.
SAT trap: Do not generalize beyond the sampling frame.
INFERENCE AND GENERALIZATION
HARD
Question 40
What is external validity?
Which choice is correct?
A) The extent to which results generalize beyond the sample
B) The strength of random assignment only
C) The size of the response variable
D) The use of a placebo
Show full solution
Correct answer: A) The extent to which results generalize beyond the sample
External validity concerns other people, settings, or times.
SAT trap: It is different from internal validity.
INFERENCE AND GENERALIZATION
HARD
Question 41
What is internal validity?
Which choice is correct?
A) The credibility of the causal conclusion within the study
B) The ability to generalize worldwide
C) The sample mean
D) The population size
Show full solution
Correct answer: A) The credibility of the causal conclusion within the study
A strong design isolates the treatment effect.
SAT trap: Representativeness alone does not establish causation.
INFERENCE AND GENERALIZATION
HARD
Question 42
Which design has stronger internal validity?
Which choice is correct?
A) Random assignment with a control group
B) Self-selected treatment groups
C) A voluntary online poll
D) A retrospective survey only
Show full solution
Correct answer: A) Random assignment with a control group
Random assignment and control reduce confounding.
SAT trap: Internal validity concerns causal credibility.
INFERENCE AND GENERALIZATION
HARD
Question 43
A result is found in a narrow laboratory setting. Which concern asks whether it works in classrooms?
Which choice is correct?
A) External validity
B) Sample mean
C) Placebo dose
D) Response rate only
Show full solution
Correct answer: A) External validity
The question asks about generalization to a new setting.
SAT trap: Strong internal validity does not guarantee broad generalization.
INFERENCE AND GENERALIZATION
HARD
Question 44
A randomized experiment has different dropout rates across treatment groups. What problem may result?
Which choice is correct?
A) Attrition bias
B) Cluster sampling
C) Perfect blinding
D) A larger population
Show full solution
Correct answer: A) Attrition bias
Differential dropout can make groups systematically different.
SAT trap: Post-assignment attrition can weaken randomization.
INFERENCE AND GENERALIZATION
HARD
Question 45
Which statement is correct?
Which choice is correct?
A) Random sampling and assignment have the same purpose
B) Sampling supports generalization; assignment supports causation
C) Assignment supports only generalization
D) Neither affects inference
Show full solution
Correct answer: B) Sampling supports generalization; assignment supports causation
They address different inference goals.
SAT trap: Do not interchange the terms.
Practice More SAT Statistics and Inference
Build accuracy with causation, generalization, confounding, and experimental design.
How Are Matched Pairs, Blocking, and Ethical Limits Tested?
These questions address crossover designs, order effects, observational alternatives, and prospective or retrospective studies.
ADVANCED STUDY DESIGN
HARD
Question 46
In a matched-pairs experiment, what is a common method?
Which choice is correct?
A) Each participant receives both treatments in random order
B) Participants choose treatment
C) Only one treatment is used
D) Every population member is surveyed
Show full solution
Correct answer: A) Each participant receives both treatments in random order
The same person serves as their own comparison.
SAT trap: Treatment order should usually be randomized.
ADVANCED STUDY DESIGN
HARD
Question 47
Why is a matched-pairs design useful?
Which choice is correct?
A) It controls person-to-person variability
B) It removes the response variable
C) It guarantees no carryover
D) It creates a census
Show full solution
Correct answer: A) It controls person-to-person variability
Within-person comparisons reduce variability from individual differences.
SAT trap: Carryover effects may still need control.
ADVANCED STUDY DESIGN
HARD
Question 48
A taste test gives each person both beverages in random order. What design is this?
Which choice is correct?
A) Matched pairs
B) Cluster sampling
C) Observational study
D) Voluntary response
Show full solution
Correct answer: A) Matched pairs
Each participant receives both treatments.
SAT trap: Random order reduces order effects.
ADVANCED STUDY DESIGN
HARD
Question 49
What is an order effect?
Which choice is correct?
A) The first treatment influences the response to the second
B) The population is alphabetized
C) The sample is too large
D) The response variable is missing
Show full solution
Correct answer: A) The first treatment influences the response to the second
Earlier exposure may affect later responses.
SAT trap: Randomize order when possible.
ADVANCED STUDY DESIGN
HARD
Question 50
What is a carryover effect?
Which choice is correct?
A) A previous treatment continues to influence a later response
B) A sample is generalized
C) A placebo is inactive
D) A cluster is selected
Show full solution
Correct answer: A) A previous treatment continues to influence a later response
Treatment effects may persist into later periods.
SAT trap: A washout period may be needed.
ADVANCED STUDY DESIGN
HARD
Question 51
Why might an experiment be unethical?
Which choice is correct?
A) It assigns a potentially harmful treatment
B) It uses a random-number generator
C) It has a control group
D) It measures an outcome
Show full solution
Correct answer: A) It assigns a potentially harmful treatment
Researchers cannot ethically impose some exposures.
SAT trap: Ethical limits often require observational studies.
ADVANCED STUDY DESIGN
HARD
Question 52
Which topic is most likely studied observationally for ethical reasons?
Which choice is correct?
A) Effects of smoking during pregnancy
B) Effects of two harmless study apps
C) Effects of two pencil brands
D) Effects of two seat locations
Show full solution
Correct answer: A) Effects of smoking during pregnancy
Researchers cannot ethically assign participants to smoke.
SAT trap: Some causal questions cannot be tested experimentally.
ADVANCED STUDY DESIGN
HARD
Question 53
What does a retrospective study do?
Which choice is correct?
A) Uses past records or memories
B) Assigns future treatments
C) Surveys every population member
D) Guarantees causation
Show full solution
Correct answer: A) Uses past records or memories
It looks backward at previous exposures and outcomes.
SAT trap: Recall and record quality may limit the study.
ADVANCED STUDY DESIGN
HARD
Question 54
What does a prospective observational study do?
Which choice is correct?
A) Follows participants forward without assigning treatments
B) Assigns everyone a placebo
C) Surveys only past events
D) Uses no response variable
Show full solution
Correct answer: A) Follows participants forward without assigning treatments
Exposures and outcomes are observed over time.
SAT trap: Prospective does not automatically mean experimental.
ADVANCED STUDY DESIGN
HARD
Question 55
A study follows runners and nonrunners for ten years without assigning exercise habits. What type is it?
Which choice is correct?
A) Prospective observational study
B) Randomized experiment
C) Matched-pairs experiment
D) Census
Show full solution
Correct answer: A) Prospective observational study
Groups are followed forward while existing behavior is observed.
SAT trap: Long follow-up does not create random assignment.
What Do Hard Mixed Study-Design Questions Look Like?
These questions combine self-selection, confounding, blinding, blocking, inference scope, replication, and control conditions.
HARD MIXED STUDY DESIGN
HARD
Question 56
Students voluntarily join tutoring, and tutoring students score higher. What is the main limitation?
Which choice is correct?
A) Motivation may confound the result
B) There is no response variable
C) The study is double-blind
D) The sample is a census
Show full solution
Correct answer: A) Motivation may confound the result
Tutoring volunteers may already be more motivated.
SAT trap: Self-selection can create alternative explanations.
HARD MIXED STUDY DESIGN
HARD
Question 57
A double-blind placebo-controlled trial most directly reduces which threat?
Which choice is correct?
A) Expectation and evaluator bias
B) Sampling variability only
C) Population undercoverage
D) Cluster effects
Show full solution
Correct answer: A) Expectation and evaluator bias
Participants and evaluators do not know assignments.
SAT trap: Blinding does not guarantee representative sampling.
HARD MIXED STUDY DESIGN
HARD
Question 58
A researcher blocks patients by age before random assignment. Why?
Which choice is correct?
A) To control age-related variation
B) To remove treatment
C) To create a voluntary sample
D) To ensure equal responses
Show full solution
Correct answer: A) To control age-related variation
Treatments are compared within similar age groups.
SAT trap: Blocks use known relevant characteristics.
HARD MIXED STUDY DESIGN
HARD
Question 59
Treatment groups differ greatly in baseline health because assignment was not random. What problem results?
Which choice is correct?
A) Confounding
B) Perfect replication
C) Blinding
D) Generalization
Show full solution
Correct answer: A) Confounding
Baseline health may explain the outcome difference.
SAT trap: Unequal starting conditions weaken causal inference.
HARD MIXED STUDY DESIGN
HARD
Question 60
A study randomly assigns 300 volunteers to two diets. Which conclusion is strongest?
Which choice is correct?
A) The diets can cause different outcomes among volunteers
B) The result applies to all adults
C) One diet works for everyone
D) No causal claim is possible
Show full solution
Correct answer: A) The diets can cause different outcomes among volunteers
Random assignment supports causation for participants.
SAT trap: Volunteer sampling limits generalization.
HARD MIXED STUDY DESIGN
HARD
Question 61
A study randomly samples 1,000 adults and records diet and blood pressure. Which conclusion is strongest?
Which choice is correct?
A) Diet is associated with blood pressure in the adult population
B) Diet definitely causes changes
C) Random assignment occurred
D) The study is placebo-controlled
Show full solution
Correct answer: A) Diet is associated with blood pressure in the adult population
Random sampling supports generalization; observation supports association.
SAT trap: Causal scope and population scope are separate.
HARD MIXED STUDY DESIGN
HARD
Question 62
A crossover study gives everyone Treatment A first. What is the main concern?
Which choice is correct?
A) Order effect
B) Undercoverage
C) Cluster sampling
D) Voluntary response
Show full solution
Correct answer: A) Order effect
Receiving A first may systematically affect the response to B.
SAT trap: Randomize treatment order.
HARD MIXED STUDY DESIGN
HARD
Question 63
Only two participants are assigned to each treatment. What weakness is most important?
Which choice is correct?
A) Weak replication
B) Excessive blinding
C) Too many blocks
D) A census
Show full solution
Correct answer: A) Weak replication
Very small groups provide little information about variation.
SAT trap: Replication strengthens reliability.
HARD MIXED STUDY DESIGN
HARD
Question 64
A control group receives the standard treatment. Why can this be appropriate?
Which choice is correct?
A) The standard treatment is the meaningful comparison
B) Controls must receive nothing
C) It creates voluntary response
D) It removes random assignment
Show full solution
Correct answer: A) The standard treatment is the meaningful comparison
Withholding effective care may be unethical or uninformative.
SAT trap: Control conditions depend on context.
HARD MIXED STUDY DESIGN
HARD
Question 65
Which design best tests whether a new study app causes score improvement?
Which choice is correct?
A) Randomly assign comparable students to the app or standard method
B) Compare existing app users and nonusers
C) Survey students who like technology
D) Ask top scorers which app they used
Show full solution
Correct answer: A) Randomly assign comparable students to the app or standard method
Random assignment creates a fair causal comparison.
SAT trap: Observing current users leaves self-selection confounding.
What Do Student-Produced Response Questions Look Like?
Enter the requested number of participants, treatment-group members, pairs, or block totals.
STUDENT-PRODUCED RESPONSE
MEDIUM
Question 66
A randomized experiment assigns 120 participants equally to 3 treatments. How many participants are in each treatment?
Enter your answer.
Show full solution
Correct answer: 40
120/3=40.
SAT trap: Enter only the requested numerical value.
STUDENT-PRODUCED RESPONSE
MEDIUM
Question 67
A study has 80 participants, with 35 in the control group. How many are in the treatment group?
Enter your answer.
Show full solution
Correct answer: 45
80-35=45.
SAT trap: Enter only the requested numerical value.
STUDENT-PRODUCED RESPONSE
MEDIUM
Question 68
A matched-pairs study uses 24 pairs. How many participants are included?
Enter your answer.
Show full solution
Correct answer: 48
Each pair contains 2 participants, so 24×2=48.
SAT trap: Enter only the requested numerical value.
STUDENT-PRODUCED RESPONSE
MEDIUM
Question 69
An experiment has 5 blocks with 12 participants in each block. How many participants are included?
Enter your answer.
Show full solution
Correct answer: 60
5×12=60.
SAT trap: Enter only the requested numerical value.
STUDENT-PRODUCED RESPONSE
MEDIUM
Question 70
A trial assigns 150 participants equally to treatment and control. How many are in the control group?
Enter your answer.
Show full solution
Correct answer: 75
150/2=75.
SAT trap: Enter only the requested numerical value.
Common SAT Observational Study and Experiment Mistakes
| Mistake | Correction |
|---|---|
| Claiming causation from observation | Use association language unless treatments were randomly assigned |
| Confusing sampling with assignment | Sampling supports generalization; assignment supports causation |
| Ignoring self-selection | Check whether participants chose treatment |
| Overlooking confounding | Identify variables related to treatment and response |
Two-Week SAT Observational Studies and Experiments Study Plan
| Days | Focus |
|---|---|
| 1-3 | Q1-Q15: study types and confounding |
| 4-7 | Q16-Q30: experiment design |
| 8-10 | Q31-Q45: inference scope |
| 11-12 | Q46-Q55: matched pairs and ethics |
| 13-14 | Q56-Q70 and error review |
Post a Comment