Question: Assuming normality and known variance 2 = 9, test the hypothesis = 60.0 against the alternative = 57.0 using a sample of

Assuming normality and known variance σ² = 9, test the hypothesis μ = 60.0 against the alternative μ = 57.0 using a sample of size 20 with mean x̅ = 58.50 and choosing α = 5%.

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