Chapter 10, Problem 21E

In Exercises 17 to 23, for the reports about statistical studies, identify the following items (if possible). If you can’t tell, then say so—this often happens when we read about a survey.

1. a) The population
2. b) The population parameter of interest
3. c) The sampling frame
4. d) The sample
5. e) The sampling method, including whether or not randomization was employed
6. f) Who (if anyone) was left out of the study
7. g) Any potential sources of bias you can detect and any problems you see in generalizing to the population of interest

21. Roadblock State police set up a roadblock to estimate the percentage of cars with up-to-date registration, insurance, and safety inspection stickers. They usually find problems with about 10% of the cars they stop.