Shopping time: House wares. How much customers buy is a direct result of how much time they spend in a store. The mean shopping time for women accompanied by children in national house wares stores is 7.3 minutes. A retail research team is studying shopping habits in the cherry creek mall (Denver). A random sample of women shoppers with children in a large house ware store gave the following shopping times (in minutes):

7.7 8.1 8.2 9.0 5.8 9.3 8.4 6.9 12.1 9.4

8.1 6.2 7.3 7.9 8.2 8.5 7.2 6.3 9.1 8.8

i) Use a calculator with the mean and the standard deviation keys to verify that xbar 8.1 min and s 1.4 min.

ii) Assume shopping time follows an approximately normal distribution. Use a 5% level of significance to test the claim that the average shopping time for women with children in the cherry creek mall is higher than the national average for this type of store.