Answers to selected problems of Chapter 1 1.8 a) sample: Set of polled Floridians Population: Set of all adult Florida residents b) Statistics since they are summaries of the sample. 1.10 Aspirin inference : a) The sample includes all the male physicians who participated in the Physicians’ Health Study. b) The population would be all male physicians. c) The inference is that aspirin would be more effective than placebo for all male physicians. 1.11 Graduating seniors’ salaries : a) These are descriptive statistics. They are summarizing data from a population – all graduating seniors at a given school. b) These analyses summarize data on a population – all graduating seniors at a given school; thus, the numerical summaries are best characterized as parameters. 1.24 a) The population is the entire UW student body of 40,858. The sample is the 100 students who were asked to complete the questionnaire. b)
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