A professor in the school of business wants to investigate the prices of new textbooks in the campus bookstore and the competing off-campus store, which is a branch of a national chain.
The professor randomly chooses the required texts for 12 business school courses and compares them prices in the two stores. The results are as follows:
Book Campus Store ($) Off-Campus Store ($)
1 55.00 50.95
2 47.50 45.75
3 50.50 50.95
4 38.95 38.50
5 58.70 56.25
6 49.90 45.95
7 39.95 40.25
8 41.50 39.95
At the .01 significance, is there any evidence of a difference in the average price of business textbooks between the two stores?