The accompanying data show the number of people working and thesales for a small bookstore. The regression line is given below.The bookstore decides to have a gala event in an attempt to drum upbusiness. They hire 103 employees for the day and bring in a totalof $ 41,000.
Sales = 7.873 + 0.946(Number of Salespeople Working)
Number of Salespeople Working // Sales
2 // 9
3 // 12
7 // 14
9 // 14
10 // 17
10 // 20
12 // 20
16 // 23
16 // 22
22 // 29
x (overline) = 10.7
y (overline) = 18.0
SD(x) = 6.13
SD(y) = 5.96
Complete parts a through d below.
a) Find the regression line predicting Sales from Number ofpeople working with the new point added.
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? .
