A farmer collected the following data, which show crop yields for various amounts of fertilizer used.
|
Fertilizer (pounds/100 sq. ft)
|
0
|
4
|
8
|
10
|
15
|
18
|
20
|
25
|
|
Yield (bushels)
|
6
|
7
|
10
|
13
|
17
|
18
|
22
|
23
|
(a) Calculate the least-squares regression line for these data.
(b) Plot the points and the least-squares regression line on the same graph.