At one school, the average amount of time that tenth-graders spend watching television each week is 18.4 hours.The principal introduces a campaign to encourage the students to watch less television.One year later, the principal wants to perform a hypothesis test to determine whether the average amount of time spent watching television per week has decreased.Formulate the null and alternative hypotheses for the study described.

Problem 3)

A two-tailed test is conducted at the 5% significance level.What is the P-value required to reject the null hypothesis?

Problem 4)

A two-tailed test is conducted at the 5% significance level.What is the right tail percentile required to reject the null hypothesis?

Problem 5)

What is the difference between a Type I and a Type II error?Provide an example of both.