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In an examination of purchasing patterns of shoppers, a sample of 16 shoppers revealed that they spent, on average, $54 per hour of shopping with the standard deviation of $21. Assuming that the amount spent per hour of shopping is normally distributed, find a 90% confidence interval for the mean amount.Consult the following table to find the critical value:Critical Value df Valuez0.1 - 1.282z0.05 - 1.645t0.1 15 1.34t0.05 15 1.75
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