A sample of n = 25 scores has a mean of M = 68. Find the z-score for this sample:
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3. A sample of n = 25 scores has a mean of M = 68. Find the z-score for this sample:
a. If it was obtained from a population with μ = 60 and σ = 10
b. If it was obtained from a population with μ = 60 and σ = 20
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