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Intro to Stat_Part_65 - 209 home decorating 172 286 163 205...

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209 home decorating news health computer 172 87 82 104 286 94 153 136 163 123 87 98 205 106 103 207 197 101 96 146 Table 13.3 Exercise 13.7 (Solution on p. 213.) Using a significance level of 5%, test the hypothesis that the four magazine types have the same average length. Exercise 13.8 Eliminate one magazine type that you now feel has an average length different than the others. Redo the hypothesis test, testing that the remaining three averages are statistically the same. Use a new solution sheet. Based on this test, are the average lengths for the remaining three magazines statistically the same? Exercise 13.9 Which two magazine types do you think have the same variance in length? Exercise 13.10 Which two magazine types do you think have different variances in length? 13.3 Review Questions 3 The next two questions refer to the following situation: Suppose that the probability of a drought in any independent year is 20%. Out of those years in which a drought occurs, the probability of water rationing is 10%. However, in any year, the probability of water rationing is 5%. Exercise 13.11: REVIEW QUESTION 1 (Solution on p. 213.) What is the probability of both a drought and water rationing occurring?
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