(a) Use the figure to construct two scatter diagrams, one for dry pavement and the other for wet pavement. Place the speed of the car on the horizontal axis. 

(b) Compute the correlation coefficient for the speed of the car and the stopping distance for dry pavement. 

(c)  Were your answers to parts (a) and (b) correct? Explain. 

(d) Determine the equation of the line of best fit for dry pavement.

(e) Repeat part (g) for wet pavement.

(f)  Use the equations in parts (g) and (h) to estimate the stopping distance of a car going 77 mph on both dry and wet pavements.

Hitting the brakes:

At high speed on a wet road, a typical midsize car may need a distance longer than two football fields to come to a stop.

Braking distance at given mph.

Round both m and b the nearest hundredth.

Transcribed Image Text:

Dry pavement 140 ft 60 mph 164 ft 65 mph 70 mph 190 ft 218 ft 75 mph 247 ft 80 mph Wet pavement 280 ft 60 mph 410 ft 65 mph 475 ft 70 mph 75 mph 545 ft 80 mph 618 ft