. 4 A market trader sells ball-point pens on his stall. He sells the pens for a different fixed price, x pens, in each of six weeks. He notes the number of pens, y that he sells in each of these six weeks. The results are shown in following table.
Week |
1 |
2 |
3 |
4 |
5 |
6 |
Pens |
10 |
15 |
20 |
25 |
30 |
35 |
Sells |
68 |
60 |
55 |
48 |
38 |
32 |
- Find the correlation coefficient between pens and sells and test the hypothesis that there is no relation between these variables.
- Find the regression equation of sells to pens
- Estimate the weekly sells for 20 pens.
- Estimate the Error.