The scatter plot shows the number of hours worked, x, and the amount of money spent on
entertainment, y, by each of 25 students.
Amount of
money spent on
entertainment
(in dollars)
45
40
35.
30.
25
20
15
5-
D
xx
10 12 14 16 18 20
Number of hours worked
Use the equation of the line of best fit, y=1.81x+11.38, to answer the questions below.
Give exact answers, not rounded approximations.
(a) What is the predicted amount of money spent on
entertainment for a student who works 12 hours?
(b) What is the predicted amount of money spent on
entertainment for a student who doesn't work any hours?
(c) For an increase of one hour in time worked, what is the
predicted increase in the amount of money spent on
entertainment?