(f) Sketch the contour at a distance

√

3̂???? from the point (̂????, ̂????, ̂????)′:

(i) when the postulated values ̂???? and ̂????2 are the maximum-likelihood estimates and

(ii) when the postulated value ̂???? is above the maximum-likelihood estimate and the postulated value ̂????2 is below the maximum-likelihood estimate.

Now suppose that ̂???? is restricted to the maximum-likelihood estimate.