The accompanying data show the number of people working and the sales for a small bookstore. The regression line is given below. The bookstore decides to have a gala event in an attempt to drum up business. They hire 98 employees for the day and bring in a total of $41,000.
sales^ = 8.097+0.902 No. of salespeople working
| No. of salespeople working |
Sales (in$1000's) |
| 2 |
9 |
| 3 |
12 |
| 7 |
13 |
| 10 |
15 |
| 10 |
18 |
| 9 |
18 |
| 13 |
21 |
| 14 |
21 |
| 16 |
22 |
| 18 |
24 |
|
|
| mean (x)=10.2 |
mean (y) =17.3 |
| SD(x)= 5.25 |
SD(y)= 4.90 |
A) Find the regression line predicting sales from no. of people working with the new point added.
B) Find the residual of the new point?