Find the regression equation to estimate the sale of tyres when the motor registration is known.Calculate coefficient of correlation by the concurrent deviation.

Statistics Practice Exercise
Questions
1. 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

2. 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

a. Find the regression equation to estimate the sale of tyres when the motor registration is known.
b. Estimate sale of tyres when registration is 850

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