In a test of hypothesis, the null hypothesis is that the population mean is less than or equal to 20 and the alternative hypothesis is that the population mean is greater than 20. The population has a normal distribution with standard deviation of 3.1. The test is to be made at the 2% significance level. In order that the value of at μ₁ = 21. 57 to be 0.02, how large a sample do we need? O e. 27 O c.9 O d. 133 O a. 66 O b. 75

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