Underinflated or overinflated tires can increase tire wear. A new tire was tested for wear at different pressures, with the results shown in the following table.
Pressure, x (pounds per square inch) Mileage, y (thousands)
30 ......................................................... 29
31 ......................................................... 32
32 ......................................................... 36
33 ......................................................... 38
34 ......................................................... 37
35 ......................................................... 33
a. Plot the data on a scatter plot.
b. If you were given only the information for x = 30, 31, 32, 33, what kind of model would you suggest? For x = 33, 34, 35, 36? For all the data?