Refer to the data on grocery retail outlet productivity and outlet size in Example. MINITAB was used to fit a quadratic model to the data and to graph the quadratic prediction curve, along with the plotted data points. Discuss the adequacy of the fitted model.
Example:
Store
Value Added per Work-Hour, y
Size of Store (thousand square feet), x
1
$4.08
21.0
2
3.40
12.0
3
3.51
25.2
4
3.09
10.4
5
2.92
30.9
6
1.94
6.8
7
4.11
19.6
8
3.16
14.5
9
3.75
25.0
10
3.60
19.1