2. A statistics professor is used to having a variance in his class grades of no more than 100. He feels that his current group of students is different, and so he examines a random sample of midterm grades (listed below.) At a = 0.05, can it be concluded that the variance in grades exceeds 100?

Question

2.	A statistics professor is used to having a variance in his class grades of no more than 100. He feels that his current group of students is different, and so he examines a random sample of midterm grades (listed below.) At a = 0.05, can it be concluded that the variance in grades exceeds 100? 
92.3	 	89.4 		96.7 		69.5 		88.5 		79.2 
76.9 		65.2		 49.1 		72.8 		67.5		 52.8 
72.9		 68.7 		75.8

Anonymous · Answer

asking twice just annoys those who want to help ...