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


a. Determine the regression equation.
b. Determine the estimated sales if 40 contacts are made.

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