A recent national survey found that high school students watched an average (mean) of 7.8 DVDs per month with a population standard deviation of 0.50 hour. The distribution of DVDs watched per month follows the normal distribution. A random sample of 30 college students revealed that the mean number of DVDs watched last month was 7.30. At the 0.05 significance level, can we conclude that college students watch fewer DVDs a month than high school students? a. State the null hypothesis and the alternate hypothesis. H0: > 7.8 ; H1: = 7.8 H0: 7.8 ; H1: > 7.8 H0: 7.8 ; H1: < 7.8 H0: = 7.8 ; H1: 7.8 b. State the decision rule. Reject H1 if z > -1.645 Reject H1 if z < -1.645 Reject H0 if z > -1.645 Reject H0 if z < -1.645 c. Compute the value of the test statistic. (Negative amount should be indicated by a minus sign.Round your answer to 2 decimal places.) Value of the test statistic