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Question 11 A random sample of size nj = 13 is selected from a normal population with a mean of 75 and a standard deviation

Question 11

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A random sample of size nj = 13 is selected from a normal population with a mean of 75 and a standard deviation of 7. A second random sample of size n2 = 7 is taken from another normal population with mean 68 and standard deviation 12. Let X , and X2 be the two sample means. Find: (a) The probability that X 1 - X2 exceeds 3. (b) The probability that 4.6

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