A. The data below represent a random sample of 9 scores on astatistics quiz. (The maximum possible score on the quiz is 10.)Assume that the scores are normally distributed with a standarddeviation of 1.6. Estimate the population mean with 93% confidence.6,10,6,4,5,7,2,9,6 6 , 10 , 6 , 4 , 5 , 7 , 2 , 9 , 6 Note: Foreach confidence interval, enter your answer in the form (LCL, UCL).You must include the parentheses and the comma between theconfidence limits.
Confidence Interval =
B. Among the most exciting aspects of a university professor'slife are the departmental meetings where such critical issues asthe color the walls will be painted and who gets a new desk aredecided. A sample of 20 professors was asked how many hours peryear are devoted to such meetings. The responses are listed below.Assuming that the variable is normally distributed with a standarddeviation of 6 hours, estimate the mean number of hours spent atdepartmental meetings by all professors. Use a confidence level of90%.
7,11,11,10,17,5,4,9,19,14,4,1,22,10,15,21,17,3,18,16
Note: For each confidence interval, enter youranswer in the form (LCL, UCL). You must include the parentheses andthe comma between the confidence limits.
Confidence Interval =
