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Independent random sample of 64 observations each are chosen from two normal populations with the means and standard deviations shown. Assume thatanddenote the two sample

Independent random sample of 64 observations each are chosen from two normal populations with the means and standard deviations shown. Assume thatanddenote the two sample means. What is the standard deviation of the sampling distribution?

Population 1

u1 = 12

1 = 4

Population 2

U2 = 10

2 = 3

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