At one school, the average amount of time that 10th-graders spend watching television each week is 21 hours. The principal introduces a campaign to encourage the students to watch less television. One year later, the principal wants to perform a significance test to determine whether the average amount of time spent watching television per week has decreased. The hypotheses are: H0: = 21 hours Ha: < 21 hours Suppose that the results of the test indicate that the null hypothesis should not be rejected. Classify that conclusion as a Type I error, a Type II error, or a correct decision, if in fact the mean amount of time, , spent watching television has decreased