Part I

Clients visiting a Chartered Accountant's Firm on busy business day had to wait exactly 15 minutes less than an hour with a standard deviation of 10 minutes before they are able to see the Accountant.

a) Compute the 90 percent confidence interval estimate for the average waiting time for all the clients visiting the office. Assume sample size is 36. [8 marks]

b) Interpret your findings. [3 marks]

Part II

Assume you found from the Annual Reports of the Local Police Station found that in a sample of 500 female reports on domestic violence over the 30-day period, 350 were not referred by the Women Crisis Centre.

a) Based on the information provided, estimate 95 percent confidence interval for all the females who have been suggested to complain at the Local Police Station by the Crisis Centre. [8 marks]

b) Interpret your findings. [3 marks]