9A A personnel researcher has designed a questionnaireand she would like to estimate the average time to complete thequestionnaire. Suppose she samples 100 employees and finds that themean time to take the test is 27 minutes with a standard deviationof 4 minutes. Construct a 90% confidence interval for the mean timeto complete the questionnaire. Also, write a short explanationabout the findings to the human resources director of your companysummarizing the results. – Use Excel for thisanalysis.
9B. For the problem in part A, the human resourcesdirector wants to know whether these is sufficient sample evidenceto conclude that the average time to complete the questionnaire isnot 27 minutes. Set up the hypotheses (in statistical terms) and,based only on the confidence interval you have constructed in partA, what would you conclude regarding the hypotheses?
H0 :
H1 :
