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Chapter 1: Problem 28
State whether the data are best described as a population or a sample. A subscription-based music website tracks its total number of active users.
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Describe the sample and describe a reasonable population. A fishing boat captain examines one day's catch of fish to see if the average weight of fish in that area is large enough to make fishing there profitable.
Political Party and Voter Turnout Suppose that we want to investigate the question "Does voter turnout differ by political party?" How might we collect data to answer this question? What would the cases be? What would the variable(s) be?
Do Parents Regret Having Children? In Data 1.4 on page \(24,\) we describe the results of a question asked by a national newspaper columnist: "If you had it to do over again, would you have children?" In addition to those results and a followup national survey, the Kansas City Star selected a random sample of parents from Kansas City and asked them the same question. In this sample, \(94 \%\) said "Yes." To what population can this statistic be generalized?
We give a headline that recently appeared online or in print. State whether the claim is one of association and causation, association only, or neither association nor causation. Daily exercise improves mental performance.
A large restaurant chain (see Example 1.6 ) periodically offers special milk shake flavors for a limited time. Suppose that the contenders for the next special flavor are Green Mint, Orange Crush, Egg Nog, and Pi帽a Colada. The chain plans to collect data from customers on these flavors, and there are several ways they might solicit responses. For each of the options below, state the number of variables needed to code the information in a dataset, whether the variable(s) is/are categorical or quantitative, and what sort of values should be recorded. (a) "Which of the four flavors is most appealing to you?" (b) "Put a check next to any of the four flavors you find appealing." (c) "Please rank the four flavors with \(1=\) most appealing and \(4=\) least appealing." (d) "Rate each of the four flavors on a 1 to 10 scale with \(10=\) extremely appealing and 1 =very unappealing."
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