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. Complete parts a through d below.
Sales = 7.919 + 0.930 Number of Salespeople Working

Number of Salespeople working Sales (in $1000's)
2 9
3 12
7 14
9 14
9 17
10 19
12 20
14 20
15 21
21 28
x = 10.2 y= 17.4

SD(x) = 5.67 SD(y) = 5.42

A) Find the regression line predicting Sales from Number of people working with the new point added.
Sales = + (___) Number of Salespeople working. (Round to three decimal places as needed)
B) What has changed from the original regression equation?
C) Is the new point a high leverage point or an influential point?
D) Does the new point have a large residual? Explain