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1.
value:
10.00 points
|
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 |
Sales ($ thousands), Y |
Number of Contacts, X |
Sales ($ thousands), 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. (Negative amounts should be indicated by a minus sign. Do not round intermediate calculations. Round final answers to 2 decimal places.) |
|
X |
Y |
|
|
( |
( |
( |
|
|
14 |
24 |
? |
? |
376.36 |
1376.41 |
719.74 |
|
|
12 |
14 |
−21.4 |
−47.1 |
? |
? |
? |
|
|
20 |
28 |
−13.4 |
? |
179.56 |
? |
443.54 |
|
|
16 |
30 |
? |
−31.1 |
? |
967.21 |
? |
|
|
46 |
80 |
12.6 |
? |
? |
357.21 |
? |
|
|
23 |
30 |
−10.4 |
? |
? |
967.21 |
? |
|
|
48 |
90 |
? |
28.9 |
213.16 |
? |
421.94 |
|
|
50 |
85 |
? |
23.9 |
275.56 |
? |
396.74 |
|
|
55 |
120 |
? |
? |
466.56 |
3469.21 |
1,272.24 |
|
|
50 |
110.0 |
16.6 |
48.9 |
? |
? |
? |
|
|
334 |
611 |
|
|
? |
? |
? |
|
|
` |
|
|
= |
33.4 |
|
|
= |
61.1 |
|
sx |
= |
? |
|
sy |
= |
? |
|
r |
= ? |
|
|
b = ? |
|
a = ? |
Y' = + X = ? |
|
b. |
Determine the estimated sales if 40 contacts are made.(Do not round intermediate calculations. Round final answers to 2 decimal places.) |
|
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