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A sample of n = 4 scores has a mean of M = 75. Find the z-score for this sample: a. If it was obtained

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

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

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

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

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