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Karscig claims that the average exam score on a 3801 class' first exam will be the same as the average score on the second exam. Forty exam 1 scores are randomly chosen and thirty-two exam 2 scores are selected. Both sets of scores are given below:
Exam 1
68
63
64
71
60
78
65
51
48
67
62
69
79
76
74
73
75
41
66
80
70
77
Exam 2
59
72
Test Karscig's claim (from our last exam) that the average exam score for Exam 1 was 70 using a two-tail test and a2% level of significance.
Test the hypothesis that there is no difference in the mean scores of Exam 1 and Exam 2 against the alternative that the average is greater for the second exam. Assume both sets of exam scores are normally distributed will 1 = 8.55 and 2 = 5.70 and use a 1% level of significance.
Then, test whether the proportion of exam I scores that arc at least 80% is the same as the proportion of exam 2 scores that are at least 80% using a two-tailed test and a 10% level of significance (Remember, these exams are 80 points total).
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