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Solved by Expert Tutors

A random sample of size 15 is taken from a normally distributed population

with a sample mean of 75 and a sample variance of 25. The upper limit of a 95% confidence interval for the population mean is equal to:

-A. 72.231
-B. 74.727
-C. 77.530
-D. 79.273

Step-by-step answer

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