Question

Here are data from a small bookstore.
Number of Salespeople Working Sales (in $1000’s)
2 ............. 10
3 ............. 11
7 ............. 13
9 ............. 14
10 ............. 18
10 ............. 20
12 ............. 20
15 ............. 22
16 ............. 22
20 ............. 26
x̄ = 10.4 .......... y-bar = 17.6
SD(x) = 5.64 ........ SD(y) = 5.34
The regression line is:
Sales = 8.10 + 0.9134
Number of Salespeople Working. The assumptions and conditions for regression are met, and from technology we learn that
SE(b1) = 0.0873 se = 1.477
a) Find the predicted Sales on a day with 12 employees working.
b) Find a 95% confidence interval for the mean Sales on days that have 12 employees working.
c) Find the 95% prediction interval for Sales on a day with 12 employees working.


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  • CreatedMay 15, 2015
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