In an examination of purchasing patterns of shoppers, a samp…
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 per hour of shopping. Assuming that the amount spent per hour of shopping is normally distributed in the population, find the margin of error for the 90% confidence interval for the mean amount. Please consult the critical values in the table below. Recall that the subscript refers to the area on the right of the critical value in the corresponding distribution. Critical Value df Value — 1.28 — 1.645 15 1.34 15 1.75
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