What test statistic should you should use to test Ho versus H1? Select one: O a. Z X-Ho - N(0,1) O b. T= tn-1 O c. W = (n-1)8 Now suppose that n = 16, the observed sample mean ä is 8.9. the observed sample variance s² is 25 and 4o = 10.5. Suppose we next want to compute a 95% confidence interval for u. What is the lower endpoint of this 95% confidence interval? Give answer to three decimal places. What is the upper endpoint of this 95% confidence interval? Give answer to three decimal places.

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