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 65 68.4 85.5 74.4 85.5 63.9 96 83.2 Test grades are believed to be normally distributed. Use a significance level of 5%. A. State the alternative hypothesis: HA : OH > 65 OH