In working further with the problem of exercise 4, statisticians suggested the use of the following curvilinear estimated regression equation.
yˆ = b0 + b1x + b2x2
a. Use the data of exercise 4 to estimate the parameters of this estimated regression equation.
b. Use α = .01 to test for a significant relationship.
c. Estimate the traffic flow in vehicles per hour at a speed of 38 miles per hour.