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An SRS of 450 high school seniors gained an average of =44 points in their second attempt at the SAT Mathematics exam. Assume that the

An SRS of 450 high school seniors gained an average of =44 points in their second attempt at the SAT Mathematics exam. Assume that the change in score has a Normal distribution with standard deviation=28.

What is the margin of error for a confidence level of 90%? Give your answer to three decimalplaces.

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