4.52 On a particular test for a very large statistics class, a random sample of n = 4 students has a mean grade X = 75 and s = 8. The grades for the entire class are known to be normally distributed. For the unknown population mean of the grades, find (a) the 95% confidence interval and (b) the 99% confidence interval. Ans. (a) Approximately from 62 to 88 (b) Approximately from 52 to 98

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