Fishing: Atlantic Salmon Homser Lake, Oregon, has an Atlantic salmon catch and release program that has been very successful. The average fi sherman’s catch has been m 5 8.8 Atlantic salmon per day (Source: National Symposium on Catch and Release Fishing, Humboldt State University).

Suppose that a new quota system restricting the number of fi shermen has been put into effect this season. A random sample of fi shermen gave the following catches per day:

12 6 11 12 5 0 2 7 8 7 6 3 12 12 i. Use a calculator with mean and sample standard deviation keys to verify that x 5 7.36 and s < 4.03.

ii. Assuming the catch per day has an approximately normal distribution, use a 5% level of signifi cance to test the claim that the population average catch per day is now different from 8.8.