In: Finance
A cost accountant has derived the following data on the weekly output of standard size boxes from a factory.
Week | Output (thousands) | Total cost (thousand dollars) |
1 |
20 |
60 |
2 | 2 | 25 |
3 | 4 | 26 |
4 | 23 | 66 |
5 | 18 | 49 |
6 | 14 | 48 |
7 | 10 | 35 |
8 | 8 | 18 |
9 | 13 | 40 |
(a) Determine the regression equation from which we can predict the
total cost in terms of the weekly production. (4%)
(b) In the following week it is planned to produce 15,000 standard size boxes. Estimate the total cost of producing this quantity. (1%)
(c) Compute the linear correlation coefficient. Interpret the result.
Week |
Output (thousands) X |
Total cost (thousand dollars) Y |
X*Y |
X^2 |
Y^2 |
1 |
20 |
60 |
1200 |
400 |
3600 |
2 |
2 |
25 |
50 |
4 |
625 |
3 |
4 |
26 |
104 |
16 |
676 |
4 |
23 |
66 |
1518 |
529 |
4356 |
5 |
18 |
49 |
882 |
324 |
2401 |
6 |
14 |
48 |
672 |
196 |
2304 |
7 |
10 |
35 |
350 |
100 |
1225 |
8 |
8 |
18 |
144 |
64 |
324 |
9 |
13 |
40 |
520 |
169 |
1600 |
Sum |
112 |
367 |
5440 |
1802 |
17111 |
Where = = 2.138
= = 14.168
Regression equation Y’= 14.168+2.318X
b) For 15000 units the total cost is y= 11.93+(2.318*15000) = 34781.9
c) Correlation coefficient=
Correlation coefficient= 0.93
The relation between output and cost are strongly related because the correlation is greater than 0.75