In an Examination of Purchasing Patterns of Shoppers, a Sample

Multiple Choice

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) [$45.36, $62.64]
B) [$47.27, $60.73]
C) [$51.84, $56.16]
D) [$52.32, $55.68]