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The National Assessment of Educational Progress (NAEP) includes a mathematical test for eighth-grade students. The test...

The National Assessment of Educational Progress (NAEP) includes a mathematical test for eighth-grade students. The test is given to an SRS of 400 eighth-graders from a large population in which the scores have standard deviation 125.

If this sample has a mean test score of 292, find a 90% confidence interval for the population mean.

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