Q: A driver records the petrol consumed on a number of journeys of different lengths. The data is presented in the table below :

Journey Length (miles) : 100 180 250 300 320

Petrol Consumption (gallons) : 3.5 5.6 7.9 8.4 9.3

(i) Which variable is independent and which is dependent?

(ii) Determine the least square regression line for above data.

(iii) Predict the petrol needed for a journey of 280 miles.

(iv) Find the error sum of square SSE.

(v) Find the linear correlation coefficient and interpret it. (vi) Find the coefficient of determination and interpret it.