Sales data were collected from a small bookstore. The following is an equation for the regression...

Sales data were collected from a small bookstore. The following is an equation for the regression line of the data.

Sales = 9.12 + 0.818(Number of Salespeople Working)

The assumptions and conditions for regression are met, and from technology, it is known that SE(b₁) = 0.0920 and S_e =1.640.

Number of Salespeople Working // Sales (in $1000s)
1 // 11
2 // 10
6 // 12
9 // 16
9 // 18
10 // 20
13 // 19
14 // 19
17 // 22
19 // 26

Complete parts a through c below.

a) Find the predicted Sales on a day with 12 employees working.

b) Find the 95% confidence interval for the mean Sales on days with 12 employees working.

c) Find the 95% prediction interval for Sales on a day with 12 employees working.

Expert Solution

orchestra answered 1 year ago

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