Among the most exciting aspects of a university professor's life are the departmental meetings where such critical issues as the color the walls will be painted and who gets a new desk are decided. A sample of 20 professors was asked how many hours per year are devoted to such meetings. The responses are listed below. Assuming that the variable is normally distributed with a standard deviation of 7 hours, estimate the mean number of hours spent at departmental meetings by all professors. Use a confidence level of 92%. 6,11,13,7,16,8,2,9,18,13,3,2,21,9,14,21,15,7,17,156,13,16,2,18,3,21,14,15,17,11,7,8,9,13,2,9,21,7,15 Note: For each confidence interval, enter your answer in the form (LCL, UCL). You must include the parentheses and the comma between the confidence limits. Hint: Use the sample standard deviation and sample mean formulas from Chapter 3 to get started. Confidence Interval =
Among the most exciting aspects of a university professor's life are the departmental meetings where such critical issues as the color the walls will be painted and who gets a new desk are decided. A sample of 20 professors was asked how many hours per year are devoted to such meetings. The responses are listed below. Assuming that the variable is
Note: For each confidence interval, enter your answer in the form (LCL, UCL). You must include the parentheses and the comma between the confidence limits.
Hint: Use the sample standard deviation and sample mean formulas from Chapter 3 to get started.
Confidence Interval =
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