Commercial airline pilots often begin as flight engineers or first officers for smaller, regional airlines. Historically, newly hired pilots at major airline companies have approximately 2000 hours of...

Commercial airline pilots often begin as flight engineers or first officers for smaller, regional airlines. Historically, newly hired pilots at major airline companies have approximately 2000 hours of flight experience. The FAA is conducting a study to determine if the mean flight experience of newly hired pilots has decreased. State the null and alternative hypotheses in terms of the population mean

A new surgical procedure has been developed to remove cataracts; it involves a smaller incision. This more expensive procedure will be implemented at a major hospital only if there is evidence that the standard deviation in time to recovery is less than seven days. A random sample of patients will receive the new procedure, and the resulting recovery times will be used to test the relevant hypothesis. Let

be the population standard deviation in recovery time. State the null and alternative hypotheses in terms of