Statistics Practice Exercise
Questions
Calculate coefficient of correlation by the concurrent deviation.
| Supply | Price |
| 112 | 106 |
| 125 | 102 |
| 126 | 102 |
| 118 | 102 |
| 118 | 104 |
| 121 | 98 |
| 125 | 96 |
| 125 | 97 |
| 131 | 95 |
| 135 | 90 |
The table shows the number of motor registrations in a certain territory for a term of 5 years and the sale of motor tyres by a firm in that territory for the same period.
| Year | Motor Registrations | No of Tyres sold |
| 1 | 600 | 1,250 |
| 2 | 630 | 1,100 |
| 3 | 720 | 1,300 |
| 4 | 750 | 1,350 |
| 5 | 800 | 1,500 |
Find the regression equation to estimate the sale of tyres when the motor registration is known.
Estimate sale of tyres when registration is 850