The following table shows the relationship between the speed of a car (mph) and the average stopping distance (feet) after the brakes are applied:
|
Speed (mph)
|
0
|
10
|
20
|
30
|
40
|
50
|
60
|
70
|
|
Distance (ft)
|
0
|
20
|
50
|
95
|
150
|
220
|
300
|
400
|
a. In the relationship between these two variables, which is the response variable (y) and which is the explanatory variable (x)?
b. Draw a scatterplot of the data. Characterize the relationship between stopping distance and speed.