Statistics

Exam Grades. 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 á = 0.05, can it be concluded that the variance in grades exceeds 100?

92.3
96.7
88.5
89.4
69.5
79.2
76.9
72.8
72.9
65.2
67.5
68.7
49.1
52.8
75.8

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  1. The midterm test scores for the seventh-period typing class are listed below.
    85 77 93 91 74 65 68 97 88 59 74 83 85 72 63 79

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