A teacher believes that students will take 20 minutes to complete an assignment. A random selection of 36 students took an average of 22 minutes to complete the assignment. Assume that the time taken to complete the assignment satisfies a normal distribution with a = 8 minutes. Test the hypothesis that the mean time for completing the assignment is more than 20 minutes at 1% significance level. Step 1: Select the correct null and alternative hypothesis for the test and the value of a: A. HO: u = a, H1: pa H1: p b or if z b C. Critical value is -b; Reject H0 only if z