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Suppose that scores on the standardized test in Physics are taken by students from A and B are N(A, 9) and N(O, 16) respectively. Two

Suppose that scores on the standardized test in Physics are taken by students from A and B are N(A, 9) and N(O, 16) respectively. Two samples were drawn with n = 9, xA = 83.7 from A, and m = 7, xO = 79.7 from B. Find the 95% CI for A O.

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