A biologist wants to test if there is any linear relationship between the amount of fertilizer supplied to aubergine plants and the subsequent yield of aubergines She selected 2 aubergine plants of the same variety and treated them weekly with a solution in which x grams of fertilizer was dissolved in a fixed quantity of water. The yield, y kilograms of aubergines was recorded.

a) Form an estimated regression model. 

b) Find the estimates using OLS.

Aubergine Plant A Plant B X 1 15 3.9 44