Stickle Soft Drinks plans to purchase advertising time on the Tuesday night “America Sings” television series, but only if it can be shown that the average age of the show’s viewers is less than 30. A random sample of 200 viewers will be selected to test a null hypothesis stating that the average of the population of “America Sings” viewers is 30 or more.
You intend to use the following decision rule: Reject the null hypothesis if the sample mean is less than 28.5 years of age. What is the significance level implied by this rule? Assume a population standard deviation of 9.6 years.