A sample of 64 items has mean 52. If the population mean under H0 is 50 and σ = 8, what is the value of the z statistic?
Correct answer D. 2.0
Explanation
The standard error is σ/√n = 8/√64 = 1. Then z = (x̄ − μ) / SE = (52 − 50) / 1 = 2.0.
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