Question: When should you use at test versus a z-test for hypothesis testing? A. when we know the population variance (2) B. when we know the

When should you use at test versus a z-test for hypothesis testing? A. when we know the population variance (2) B. when we know the population mean (u) C.when we do not know the population variance (2D. when we do not know the population mean (u)

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