Does it pay to study for an exam? The number of hours studied, x, is compared to the exam grade received, y:

x 2 5 1 4 2 y 80 80 70 90 60

a. Find the equation for the line of best fit.

b. Draw the line of best fit on the scatter diagram of the data drawn in Exercise 3.15 (p. 158).

c. Based on what you see in your answers to parts a and

b, does it pay to study for an exam?

Explain.