The marketing manager of a large supermarket chain would like to use shelf space to predict the sales of pet food. For a random sample of 15 similar stores, she gathered the following information regarding the shelf space, in feet, devoted to pet food and the weekly sales in hundreds of dollars.

Store	Shelf Space	Weekly Sales
1	5	1.3
2	5	1.6
3	5	1.4
4	10	1.7
5	10	1.9
6	10	2.3
7	15	2.2
8	15	2
9	15	1.8
10	20	2.2
11	20	2.4
12	20	2.9
13	25	2.9
14	25	2.7
15	25	2.5