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 85.5 83.2 66.5 68.4 85.5 61.9 96 63.9 63.9 85.5 Test grades are believed to be normally distributed. Use a significance level of 5% A. State the alternative hypothesis: HA: Ou > 65 Ou