8. Suppose the state decides to randomly test high school wrestlers for steroid use. There are 16 teams in the league. and each team has 20 wrestlers. State investigators plan to test 32 of these athletes by randomly choosing two wrestlers from each team. Is this a simple random sample? a. Yes, because the wrestlers were chosen at random. b. Yes. because each wrestler is equally likely to be chosen. c. No, because not all possible groups of 32 wrestlers could have been the sample. d. No. because a random sample of teams was not first chosen. 9. Which statement about bias is true? I. Bias results from random variation and will always be present It. Bias results from a sampling method likely to produce samples that do not represent the population. tit. Bias is usually reduced when the sample size is larger. a. land lll b. it and Ill 0. I only d. it only I 10. The owner of a car dealership planned to develop strategies to increase sales. He hoped to learn the reasons why many people who visit his car lot do not eventually buy a car from him. For one month he asked his sales staff to keep a list of the names and addresses of everyone who came in to test drive a car. At the end of the month he sent surveys to the people who did not buy a car, asking them why. About one third of them returned the survey, with 44% of those indicating that they found a lower price elsewhere. Which is true? I l. The population of interest is all potential car buyers. II. This survey design suffered from nonresponse bias. Ill. Because it comes from a sample 44% is a parameter, not a statistic. a. I and II b. II and III C. I. ll, and Ill . d. none of the above