Calculate coefficient of correlation by the concurrent deviation.

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