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Suppose that scores on the mathematics part of the National Assessment of Educational Progress (NAEP) test...

Suppose that scores on the mathematics part of the National Assessment of Educational Progress (NAEP) test for eighth-grade students follows a normal distribution with sd equal to 110. You want to estimate the true mean score within +/- 10 points with 90% confidence.

Suppose you find out that the most you can sample is only 225 subjects. Now estimate the confidence level you could attain with n=225.

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TOPIC: Confidence level for a specified margin of error.

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