Comparison shopping is available on the Internet, and this is useful because exactly the same item is

Question:

Comparison shopping is available on the Internet, and this is useful because exactly the same item is available at a variety of prices. Table 9.6.1 shows results from MySimon for prices of the Eureka 4750A Bagged Upright Vacuum at 15 stores. Find the 95% confidence interval for the average price in the population that these particular stores represent.

TABLE 9.6.1 Prices of the Eureka 4750A Bagged Upright Vacuum Cleaner Store Price ($) AJ Madison 56.05 Amazon Marketplace