Question

The display gives the result of performing a quadratic regression on a data set where the inputs are speeds in miles per hour and the outputs are the corresponding braking distances in feet. What is the stopping distance for a vehicle traveling at 20 mph?

Answer 1

Y = a x² + b x + c
y = 0.0473809524 · 20² + 2.221428571 · 20 - 0.005952381 = 
= 18.95236 + 44.42875 - 0.05952381 = 63.374978 ≈ 63.4
Answer: C ) 63.4 ft.