A researcher was interested in teaching couples to communicate more effectively. She had 20 volunteer couples, 10 of which were randomly assigned to receive the training program and 10 of which were not. After they had been trained (or not), she presented each of the 20 couples with a hypothetical problem situation and asked them to resolve it while she tape-recorded their conversation. She was blind as to which 10 couples had taken the training program until after she had analyzed the results.
Answer to relevant QuestionsResearchers ran an advertisement in a campus newspaper asking for sedentary volunteers who were willing to begin an exercise program. The volunteers were allowed to choose which of three programs they preferred: jogging, ...Suppose an observational study finds that people who use public transportation to get to work have better knowledge of current affairs than those who drive to work, but that the relationship is weaker for well-educated ...Pick one of the news stories in the Appendix that describes an observational study and that has one or more journal articles accompanying it on the companion website. Explain what was done in the experiment using the ...Three types of pictures were presented in this chapter: stemplots, histograms, and boxplots. Explain the features of a data set for which: a. Stemplots are most useful. b. Histograms are most useful. c. Boxplots are most ...The students surveyed for the data on exercising in Example 7.4 were also asked “How many alcoholic beverages do you consume in a typical week?” Five-number summaries for males’ and females’ responses are a. Draw ...
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