In an examination of purchasing patterns of shoppers, a sample of 16 shoppers revealed that they spent, on average, $54 per hour of shopping. based on previous years, the population standard deviation is thought to be $21 per hour of shopping. assuming that the amount spent per hour of shopping is normally distributed, find a 90% confidence interval for the mean amount.
a. [$51.8409, $56.1591]
b. [$52.3174, $55.6826]
c. [$45.3637, $62.6363]
d. [$47.2695, $60.7305]
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