A carpet manufacturer is studying differences between two of its major outlet stores. The company is particularly interested in the time it takes before customers receive carpeting that has been ordered from the plant. Data concerning a sample of delivery times for the most popular type of carpet are summarized as follows. Store A B Mean 34.3 43.7 days Standard deviation 2.4 3.1 days Sample size 41 31 Is there evidence of a difference in the average delivery time for the two outlet stores?