Suppose the true model describing the relation between x and y is Where the εi are independently

Suppose the €œtrue€ model describing the relation between x and y is

Where the εi are independently generated from a N (0, σ2 i) distribution. Let Ʃ be a matrix with diagonal entries σ2 1, σ2 2. . . σ2 n . What is the covariance matrix for the ordinary least squares parameter estimators? How does this relate to the discussion of different estimators of the variance in Section 11.2.2?
(a) Population Counts and (b) Sample Sizes for Exercise 30.

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(a) Population Counts Age Group 25 >25 Fİ 50 100 M 250 900