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in a random sample of 21 people, the mean number of books they

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in a random sample of 21 people, the mean number of books they read in the past year was 10.53 books and the standard deviation was 16.60 books. Assume the variable is normally distributed and use a t-distribution to construct a 90% confidence interval for the population mean U. What is the margin of error of U?

The confidence interval for the population mean u is (?,?). round to the nearest hundredth as needed

The margin of error of U is (?).round to the nearest hundredth as needed