Statistics students believe that the mean score on a first statistics test is 65. The instructor thinks that the mean score is higher. She samples 10 statistics students and obtains the scores: Grades 64.3 62.7 83.2 88 61.9 96 64.3 74.4 69 65 Test grades are believed to be normally distributed. Use a significance level of a = 5%. (critical value to = to.05 = 1.8331) A. State the alternative hypothesis: HA: < 65 # 65 > 65