Question: A hypothesis will be used to test that a population mean equals 5 against the alternative that the population mean is less than 5 with

A hypothesis will be used to test that a population mean equals 5 against the alternative that the population mean is less than 5 with unknown variance. What is the critical value for the test statistic T₀ for the following significance levels?

(a) α = 0.01 and n = 20

(b) α = 0.05 and n = 12

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