This question should be answered using SAS.

The administrator of a nursing home would like to do a time-and-motion study of staff time spent per day performing non-emergency tasks. Prior to the introduction of some policy changes, the average number of person-hours per day spent on these tasks was = 16. The administrator wants to test whether the policy changes have affected the value of, so the relevant hypotheses are Ho: = 16 vs. Ha: 16. Due to time constraints, the administer can only take a sample of 10 days. Calculate the power that would be achieved by a test of the proposed hypotheses if she wants a test having = 0.05,she is trying to detect a difference of 6 person-hours*, and we assume = 7.64.