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