Write the letter of the response that best answers each problem.
|
x (lb hundreds)
|
26
|
35
|
29
|
39
|
20
|
|
y(mpg)
|
22.0
|
16.1
|
18.8
|
15.7
|
23.4
|
1. Does the weight of a vehicle affect the gas mileage? The following random sample was collected where x = weight of a vehicle in hundreds of pounds and y = miles per gallon.
(a) -0.941
(b) 0.941
(c) -0.970
(d) 0.970
(e) 0.965
2. If a vehicle weights 2200 pounds, what does the least-squares line predict for the miles per gallon?
(a) 22.7
(b) 66.0
(c) 42.4
(d) 22.0
(e) cannot determine