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A random sample of n=49 shoppers showed that they spend an average of x= $23.45 per visit at the Saturday Mornings Bookstore. The standard deviation

A random sample of n=49 shoppers showed that they spend an average of x= $23.45 per visit at the Saturday Mornings Bookstore. The standard deviation of the population is =$2.80 . Find the 90% confidence interval of the true mean.

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