(Answered) A simple random sample of 120 sat scores has a mean of

Statistics

A simple random sample of 120 SAT scores has a mean of 1540. Assume that SAT scores have a population standard deviation of 333.

(a) Construct a 95% confidence interval estimate of the mean SAT score.

(b) Is a 99% confidence interval estimate of the mean SAT score wider than the 95% confidence interval estimate you got from part (a)? Why? [You don't have to construct the 99% confidence interval]

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