Question

A beverage company specializing in sales of champagne reports four years of quarterly sales as follows (in millions of $):
Quarter Sales ($ M)
1 ............ 12
2 ............ 41
3 ............ 15
4 ............ 48
5 ............ 25
6 ............ 55
7 ............ 23
8 ............ 69
9 ............ 51
10 ............. 80
11 ............. 54
12 ............. 87
13 ............. 64
14 ............. 94
15 ............. 62
16 ............. 108
The regression equation is Predicted Sales = 14.15 + 4.87 Quarter.
a) Find the residuals.
b) Plot the residuals against Quarter.
c) Compute the Durbin-Watson statistic.
d) At α = 0.05, what are the values of dL and dU?
e) Is there evidence of positive autocorrelation? Explain.
f) Is there evidence of negative autocorrelation? Explain.


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  • CreatedMay 15, 2015
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