For each exercise, perform these steps. Assume that all variables are normally or
Chapter 9, Problem 3(choose chapter or problem)
For each exercise, perform these steps. Assume that all variables are normally or approximately normally distributed. a. State the hypotheses and identify the claim. b. Find the critical value(s). c. Compute the test value. d. Make the decision. e. Summarize the results. Use the traditional method of hypothesis testing unless otherwise specified.Communication Times According to the Bureau of Labor StatisticsAmerican Time Use Survey (ATUS), married persons spend an average of 8 minutes per day on phone calls, mail, and e-mail, while single persons spend an average of 14 minutes per day on these same tasks. Based on the following information, is there sufficient evidence to conclude that single persons spend, on average, a greater time each day communicating? Use the 0.05 level of significance. Single Married Sample size 26 20 Sample mean 16.7 minutes 12.5 minutes Sample variance 8.41 10.24
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