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A simple random sample of size n is drawn from a population that is normally distributed. The sample mean x-bar is is found to be 114 and the sample standard deviation , s, is found to be 10.

A. Construct a 90% confidence interval about u if the sample size n is 15.

B. Construct a 90% confidence interval about u if the sample size n is 21.

C Construct a 99% confidence interval about u if the sample size is 15. show work

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