# Question

A sample of n = 4 scores has a mean of µ = 75. Find the z-score for this sample:

a. If it was obtained from a population with µ = 80 and σ = 10.

b. If it was obtained from a population with µ = 80 and σ = 20.

c. If it was obtained from a population with µ = 80 and σ = 40.

a. If it was obtained from a population with µ = 80 and σ = 10.

b. If it was obtained from a population with µ = 80 and σ = 20.

c. If it was obtained from a population with µ = 80 and σ = 40.

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