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: For a random sample of 400 people, the mean cost for textbooks during the first semester of college was found to be $371.75, and

: For a random sample of 400 people, the mean cost for textbooks during the first semester of college was found to be $371.75, and the sample standard deviation was $38.44. Assuming that the population is normally distributed, find the margin of error of a 90% confidence interval for the population mean.

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