Solved: For Exercises 8 through 19, assume that all variables are normally distributed

Chapter 12, Problem 18

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For Exercises 8 through 19, assume that all variables are normally distributed, that the samples are independent, and that the population variances are equal. Also, for each exercise, perform the following steps. a. State the hypotheses and identify the claim. b. Find the critical value. c. Compute the test value. d. Make the decision. e. Summarize the results, and explain where the differences in the means are. Use the traditional method of hypothesis testing unless otherwise specified.Commute Times Three random samples of times (in minutes) that commuters are stuck in traffic are shown. At a 0.05, is there a difference in the mean times among the three cities? What factor might have influenced the results of the study? (The information in this exercise will be used in Exercise 8 of Section 122.) Dallas Boston Detroit 59 54 53 62 52 56 58 55 54 63 58 49 61 53 52 S