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A sample of n = 4 scores is selected from a normal population with a mean...

A sample of n = 4 scores is selected from a normal population with a mean of µ = 50 and a standard deviation of σ = 20. What is the probability of obtaining a sample mean greater than M = 48?

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Answer #1

µ = 50

sd = 20

n = 4

                         

                          = P(Z > -0.2)

                          = 1 - P(Z < -0.2)

                          = 1 - 0.4207

                          = 0.5793 (ans)

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