Question: Using the sampling distribution determined for X = (X 1 + X 2 ) / 2 in Exercise 7.4, verify that E [X] =

Using the sampling distribution determined for X̅ = (X1 + X2) / 2 in Exercise 7.4, verify that E [X̅] = μ and sd(X̅) = σ/ √2.


Data from in Exercise 7.4

From the set of numbers { 3, 5, 7 }, a random sample of size 2 is selected with replacement.

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