In a study on speed and braking distance, researchers looked for a method to estimate how fast a person was traveling before an accident by measuring the length of the skid marks. An area that was focused on in the study was the distance required to completely stop a vehicle at various speeds. Use the following table to answer the questions.

MPH Braking distance (feet)
20 20
30 45
40 81
50 133
60 205
80 411
Assume MPH is going to be used to predict stopping distance.

Find the linear regression equation.

What does the slope tell you about MPH and the braking distance? How about the yʹ intercept?

Find the braking distance when MPH = 45.

Find the braking distance when MPH = 100.

Comment on predicting beyond the given data values.