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Design of a Study: Sampling, Surveys, and Experiments Multiple Choice Practice Problems for AP Statistics (page 2)

By — McGraw-Hill Professional
Updated on Feb 5, 2011

Solutions

  1. The correct answer is (e). The data are paired because there are two measurements on each city so the data are not independent. There is no treatment being applied, so this is an observational study. Matched pairs is one type of block design, but this is NOT an experiment, so III is false.
  2. The answer is (a). In order for this to be an SRS, all samples of size 40 must be equally likely. None of the other choices does this [and choice (d) isn't even random]. Note that (a), (b), and (c) are probability samples.
  3. The correct answer is (d). These three items represent the three essential parts of an experiment: control, randomization, and replication.
  4. The correct answer is (b). You block men and women into different groups because you are concerned that differential reactions to the medication may confound the results. It is not completely randomized because it is blocked.
  5. The correct answer is (e).
  6. The correct answer is (b). This is an example of a voluntary response and is likely to be biased in that those that feel strongly about the issue are most likely to respond. The other choices all rely on some probability technique to draw a sample. In addition, responses (c) and (e) meet the criteria for a simple random sample (SRS).
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