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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 salesperson sampled.
Salesperson
Contacts (x)
Sales (y)
Robert Armstrong
14
24
Jack Bender
12
Dorothy Brumley
20
28
Carmen Carella
16
30
Annette Perrault
46
80
Mary Jane Duryee
23
David Gwyer
48
90
Harvey Lazik
50
85
Ray Osbeck
55
120
Al Montanaro
110
A. Determine the regression equation.
B. Determine the estimated sales if 40 contacts are made.
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