Mr. Rogers - AP Statistics Objectives
Unit Plan Practice Test
                         AP Statistics  Practice Test Chapter 5
1)   What is the most serious weakness of experiments compared to observational studies? Experiments create an artificial environment
2)   What are the effects of sample size on the validity of an observational study or a survey? The larger the sample size the greater the confidence in the result. Larger sample size also tends to reduce study to study variability,
3)   What problem does a double blind test address? Bias of the researchers and of the subjects
4)   A marketing expert surveys every 20th person as they walk out the door of a store. Is this a simple random sample (SRS)? No
5)   List the main problem that a survey may have which a census will not. Sampling error
6)   List the main problem of a census. Cost (time and money)
7)   Which technique is designed to reduce bias in experiments? Randomization
8)   Describe a double blind test.
9)   Describe the key factor in matched pairs experiments. All subjects get all treatments
10)   Give examples of response bias. Intimidating question or interviewer
11)  Design a survey for Southside which determines preference in presidential candidates. decide possible lurking variables, set up homogeneous strata, label and table within each strata to select the sample

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