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A population has the mean of µ = 45 and standard deviation of σ = 20. Find out the z-score corresponding to each of following sample means obtained from this population (hint: employ the standard error).

 A. mean = 47 for a sample of n = 4 scores

 B. mean = 47 for a sample of n = 100 scores   

 C. mean = 40 for a sample of n = 16 scores

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