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Kmart store chain is interested in estimating the mean amount its credit card customers spent on...

Kmart store chain is interested in estimating the mean amount its credit card customers spent on their first visit to the chain's new store in Mandurah. Fifteen credit card accounts were randomly sampled and analyzed with the following results: top enclose x = $50.50 and S = 20. Assuming the distribution of the amount spent on their first visit is approximately normal, construct a 95% confidence interval for the mean amount its credit card customers spent on their first visit to the chain's new store in Mandurah.

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