A student conducted a research to check it' the weights of lambs (kg) can be estimated by making use of the heart girth instead of a conventional scale. She assumed the relationship between weight and girth can be expressed using a simple linear regression model. Table 3. Heart girths and weight of lambs Lamb \" \" \" (a) Use the Least Squares method to t a regression equation '1' on X. (B) _ .- .- u n n .E- {b} Comment on the regression coefficients a and b in {a} above. {2}