Question: Given a sample of n1 = 30 from a population with known standard deviation 1 = 10, and an independent sample of n2 = 30

Given a sample of n1 = 30 from a population with known standard deviation σ1 = 10, and an independent sample of n2 = 30 from another population with known standard deviation σ2 = 15, what is the value of the Z test statistic for testing H0: μ1 = μ2 if mean X

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1 = 72 and X

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2 = 66?

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