HP 17BIIPLUS Owner's Manual page 135

Number of Minutes
Week 1
Week 2
Week 3
Week 4
Week 5
Week 6
BJ's wants to determine whether there is a linear relationship between
the amount of radio advertising and the weekly sales. If a strong
relationship exists, BJ's wants to use the relationship to forecast sales. A
graph of the data looks like this:
3,000
2,000
SALES in Dollars
1,000
of Radio
Advertising
(x-values,
MINUTES )
2
1
3
5
5
4
y
B
0 1 2 3 4
of Advertising
10: Running Total and Statistics 135
Dollar Sales
(y-values,
SALES )
$1,400
$ 920
$1,100
$2,265
$2,890
$2,200
(forecasted)
x
5 6 7