Question

A random sample of n=9 scores is obtained from a population with μ=50 and σ=9. If the sample mean is M=53, what is the z-score corresponding to the sample mean?

Answer 1

The z-score corresponding to the sample mean is 1

Explanation:

z-score = (sample mean - population mean) ÷ (sd/√n)

sample mean = 53, population mean = 50, sd = 9, n = 9

z-score = (53 - 50) ÷ (9/√9) = 3÷3 = 1