Walk through

16. Mr. James McWhinney, president of Daniel-James Financial Services, believes there is a relationship between the number of client contacts and the dollar amount of sales. To document this assertion, Mr. McWhinney gathered the following sample information. The X column indicates the number of client contacts last month, and the Y column shows the value of sales ($ thousands) last month for each client sampled.
Number of Sales Number of Sales
Contacts, ($ thousands), Contacts, ($ thousands),
X Y X Y
14 24 23 30
12 14 48 90
20 28 50 85
16 30 55 120
46 80 50 110
a. Determine the regression equation.
b. Determine the estimated sales if 40 contacts are made.
18. The regression equation is
Sales = -19.7 – 0.00063 outlets + 1.74 cars + 0.410 income
+ 2.04 age – 0.034 bosses
Predictor Coef StDev t-ratio
Constant -19.672 5.422 -3.63
Outlets -0.000629 0.002638 -0.24
Cars 1.7399 0.5530 3.15
Income 0.40994 0.04385 9.35
Age 2.0357 0.8779 2.32
Bosses -0.0344 0.1880 -0.18
Analysis of Variance
SOURCE DF SS MS
Regression 5 1593.81 318.76
Error 4 9.08 2.27
Total 9 1602.89
c. Conduct a global test of hypothesis to determine whether any of the regression coefficients are not zero. Use the .05 significance level.

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16. Mr. James McWhinney, president of Daniel-James Financial Services, believes there is a relationship between the number of client contacts and the dollar amount of sales. To document this assertion, Mr. McWhinney gathered the following sample information. The X column indicates the number of client contacts last month, and the Y column shows the value of sales ($ thousands) last month for each client sampled.

Number of Sales Number of Sales
Contacts, ($ thousands), Contacts, ($ thousands),
X Y X Y
14 24 23 30
12 14 48 90
20 28 50 85
16 30 55 120
46 80 50 110

a. Determine the regression equation.
b. Determine the estimated sales if 40 contacts are made.
18. The regression equation is
Sales = -19.7 – 0.00063 outlets + 1.74 cars + 0.410 income
+ 2.04 age – 0.034 bosses

Predictor Coef StDev t-ratio
Constant -19.672 5.422 -3.63
Outlets -0.000629 0.002638 -0.24
Cars 1.7399 0.5530 3.15
Income 0.40994 0.04385 …

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Week-6-Compre….doc

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