Sample mean in the middle of the distribution

Reference no: EM1396097

A normal-shaped distribution has a μ = 80 and a standard deviation of σ =15.

a. Sketch the distribution of sample means for samples of n = 25 from this population

b. What are the z-score values that form the boundaries for the middle 95% of the distribution of sample means?

c. Compute the z-score for M = 89 for a sample of n = 25 scores. Is this sample mean in the middle 95% of the distribution?

Reference no: EM1396097

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