Refer to Suppose alternative B is the correct answer. (a) For this alternative, state the observed frequencies of correct and incorrect answers. (b) What are the expected frequencies if the students are just guessing? (c) Suppose we wish to test the null hypothesis that the frequencies of correct and incorrect answers to alternative B are in accord with random guessing. State H0 in terms of the proportion guessing correctly. (d) Compute X2 and perform a non directional test of H0 at a = .05. Draw final conclusions. (e) Suppose we wish to test H0 against the alternative that at least some students know the correct answer. State HA. (f) Why can we perform a directional test here but not in Problem 7? 9.