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Which of the following samples is least likely to be obtained for the given problem?

For a normal population with u. = 80 and a = 20 which of the following samples is least probable to be obtained?

a. M = 88 for a sample of n = 4 J
b. M = 84 for a sample of n = 4
c. M = 88 for a sample of n = 25 I
d. M = 84 for a sample of n = 25

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