8.Is a 90% confidence interval estimate of the mean SAT Math score wider than the 95% confidence interval estimate you got from part 2 in Problem 5)?Why? Note: you dont have to construct the 90% confidence interval.

5 Answer

Construct a 95% confidence interval estimate of the mean Math score for the seniors in the High School.Show work and round the answer to two decimal places.

Z for 95% interval = 1.96

x-bar +/- Z*standard deviation/sqrt(n)

650 +/- 1.96(200/sqrt(100)

650 +/- 1.96(20)

650 +/- 39.2

610.8, 689.2