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Average of the means

If a population has a standard deviation of 18, what is the minimum number of samples that need to be averaged in order to be 95% confident that the average of the means is within 2 of the true mean?

A. 612

B. 18

C. 312

D. 36

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## Q : Give the null hypothesis and the alternate hypothesis

For each of the following statements, give the null hypothesis (Ho), and the alternate hypothesis (H1).