Unit 3 Practice Test - AP Statistics Sampling & Experiments

Sep 20, 2026

AP Statistics Unit 3 practice test covering sampling methods, study design, and key principles of experimental design. Questions assess how to gather data for comparing groups, determine whether sampling approaches are simple random samples, and interpret true statements about sampling error and bias. Additional items evaluate prospective studies, randomized experiments, control via blocking, confounding issues, temperature and brand effects, and classification of experimental designs, including factors and blocking.

LanguageEnglish

CategoryExam

FormatPDF

Pages4

Reading Time10 min

AccessFree to download

Unit 3 Practice Test

Sampling and Study Design

Experimental Design Principles

Blocking, Confounding, and Randomization

Unit 3 Practice TestGatering Da-Parm 1.If we wish to compare the average PSAT scores of boys and giris takmg AP Statistics at this highschool,which would be the best way to gather these data? A)censusB)SRSC)stratified sample D)observational studyE)experiment 2.A factory has 20 assembly lines producing a popular toy.To inspect a representative sample of 100toys,quality control staff randomly selected 5 toys from each line's output.Was this a simple randomlina'a Antn₃ KXan'+hir em la rAAomsample? A)Yes,because the toys were selected at random. B)Yes,because each toy produced had an equal chance to be selected. C)Yes,because a stratified sample is a type of simple random sample. D)No,because not all combinations of 100 toys could have been chosen. E)No,because toys do not come off the assembly line at random, ¹ 3.Which is true about sampling? I.An attempt to take a census will always result in less bias than sampling.II.Sampling error is usually reduced when the sample size is larger. H.Sampling error is the result of random variations and is always present. # A)I onlyB)II onlyC)IⅢ onlyD)II and ⅢE)all three 4.The owner of a car dealership planned to develop strategies to increase sales.He hoped to learn thereasons why many people who visit his car lot do not eventually buy a car from him.For one month heasked his sales staff to keep a list of the names and addresses of everyone who came in to test drive acar.At the end of the month he sent surveys to the people who did not buy the car,asking them why.About one third of them returned the survey,with 44%of those indicating that they found a lower price 0elsewhere.Which is true? I.The population of interest is all potential car buyers.II.This survey design suffered from non-response bias. ⅢI.Because it comes from a sample 44%is a parameter,not a statistic. A)I onlyB)I onlyC)I and II onlyD)II and I onlyE)I,II,and II 5.Does regular exercise decrease the risk of cancer?A researcher finds 200women over 50 whoexercise regularly,pairs each with a woman who has a similar medical history but does not exercise,then follows the subjects for 10 years to see which group develops more cancer.This is a A)surveyB)retrospective studyC)prospective study D)randomized experimentE)matched experiment 6.Which is important in designing a good experiment? I.Randomization in assigning subjects to treatments.II.Control of potentially confounding variables.III.Replication of the experiment on a sufficient number of subjects. A)I onlyB)I and IIC)I and IID)II and IE)all three 7.Can watching a movie temporarily raise your pulse rate?Researchers have 50 volunteers checktheir pulse rates.Then they watch an action film,after which they take check their pulse rates oncemore.Which aspect ofexperimentation is present in this research? A)a placeboB)blindingC)randomization D)a control groupE)none of these 8.In an experiment the primary purpose of blocking is to reduceA)bias. B)confounding. C)randomness. # D)undercoverage.E)variation. 9.To check the effect of cold temperatares on the battery's ability to start a car researchers purchaseda battery from Sears and one from NAPA.They disabled a car so it would not start,put the car in awarm garage,and installed the Sears battery.They tried to start the car repeatedly,keeping track of thetotal time that elapsed before the battery could no longer turn the engine over.Then they moved the caroutdoors where the temperature was below zero.After the car had chilled there for several hours theresearchers installed the NAPA battery and repeated the test.Is this a good experimental design? A)Yes B)No,because the car and the batteries were not chosen at random. C)No,because they should have tested other brands of batteries,too, D)No,because they should have tested more temperatures. E)No,because temperature is confounded by brand. 10.Twenty dogs and 20 cats were subjects in an experiment

FAQs

What are the key components of a good experiment?

A good experiment includes randomization, control of confounding variables, and replication with a sufficient number of subjects.

Sep 20, 2026

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