Question: 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 twelve similar stores, she gathered the following information regarding the shelf space, in feet, devoted to pet food & the weekly sales in hundreds of dollars.
Store
|
1
|
2
|
3
|
4
|
5
|
6
|
Shelf Space (X)
|
5
|
5
|
5
|
10
|
10
|
10
|
Weekly Sales (Y)
|
1.6
|
2.2
|
1.4
|
1.9
|
2.4
|
2.6
|
Store
|
7
|
8
|
9
|
10
|
11
|
12
|
Shelf Space (X)
|
15
|
15
|
15
|
20
|
20
|
20
|
Weekly Sales (Y)
|
2.3
|
2.7
|
2.8
|
2.6
|
2.9
|
3.1
|
Calculate the value of the sample correlation coefficient between weekly sales & shelf space.
[A] 0.652
[B] 0.308
[C] 0.684
[D] 0.827