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OpenStudy (anonymous):
We want to find an interval estimate of the amount spent by a shopper at the mall. A random sample of 36 customers yields a sample mean of $63 spent and a sample standard deviation of s = $20. (a). Find a 90% confidence interval for the mean amount spent. (b). Find a 95% confidence interval for the mean amount spent. (c). Which interval is wider? Explain why?
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