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n SRS of 500 high school seniors gained an average of =42 points in their second attempt at the SAT Mathematics exam. Assume that the

n SRS of 500 high school seniors gained an average of =42 points in their second attempt at the SAT Mathematics exam. Assume that the change in score has a Normal distribution with standard deviation=23.deviation

Macmillan Learning

Find a 90% confidence interval for = based on this sample. Give your answers to three decimalplaces.

lowerbound:

upper bound

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