Q:

1.   The regression has been rerun below with “outlets” and “bosses” eliminated. Compute the coefficient of determination. How much has R² changed from the previous analysis?

a.  The regression equation is

b.  sales  =    -18.9  +  1.61 cars +   0.400 income  +   1.96 age

c.             Predictor             Coef          StDev        t-ratio

d.             Constant            -18.924          3.636           -5.20

e.             cars                1.6129         0.1979           8.15

f.             income             0.40031        0.01569          25.52

g.             age                 1.9637         0.5846           3.36

h.  Analysis of Variance

i.             SOURCE          DF          SS         MS

j.             Regression       3     1593.66     531.22

k.             Error            6        9.23       1.54

l.             Total            9     1602.89

 

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