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Construct the indicated confidence interval for the population mean µ using (A) a t-distribution. (B) if you had incorrectly used a normal distribution, which interval would be wider?

C= 0.90 , X= 13.9 S = 2.0 , N= 7

A. The 90% confidence interval using a t distribution is

B. If incorrectly used a normal distribution , which interval would be wider?

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