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A major department store chain is interested in estimating the mean amount its credit card...

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A major department 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 the mall Fifteen credit card accounts were randomly sampled and analyzed with the following results sample mean 50 50 and sample standard deviation 20 Assuming the distribution of the amount spent on their first visit is normal what is the shape of the sampling distribution of the sample mean that will be used to create the desired confidence interval for population mean a standard normal distribution O at distribution with 15 degrees of freedom Oat distribution with 14 degrees of freedom approximately normal with a mean of 50 50

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