Question: If I want to test the null hypothesis that the mean is 50 versus the alternative that it is greater than 50 and I get

If I want to test the null hypothesis that the mean is 50 versus the alternative that it is greater than 50 and I get a sample mean of 40, which is true? Option A I cannot say anything, I need to know the standard deviation and the sample size. Option B Always reject the null hypothesis. Option C Never reject the null hypothesis. Option D Reject the null if n > 30, otherwise fail to reject

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