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Section A 76 80 79 79 87 60 72 58 68 65 74 70 Section B 77 84 90 66 64 93 78 64 74

Section A 76 80 79 79 87 60 72 58 68 65 74 70

Section B 77 84 90 66 64 93 78 64 74 78 93 76

Assuming population standard deviations of marks for section A and B are equal.

I. Obtain 99% confidence interval for the difference of mean marks 1- 2 obtained by students in sections A and B.

II. Interpret the confidence interval.

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