Question: A hypothesis will be used to test that a population mean equals 15 against the alternative that the population mean is less than 15 with

A hypothesis will be used to test that a population mean equals 15 against the alternative that the population mean is less than 15 with unknown variance. What is the critical value for the test statistic T0 for the following significance levels? (a) = 0.05 and n = 20 (b) = 0.01 and n = 15 (c) = 0.1 and n = 18.

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