For Table 7.5, the cumulative probit model has fit Φ^€“1[PÌ‚(Y ‰¤ j)] = α̂_j€“ 0.195x₁+ 0.683x₂, with α̂₁= €“0.161, α̂₂= 0.746, and α̂₂= 0.746, and α̂₃= 1.339. Find the means and standard deviation for the two normal cdf€™s that provide the curves for PÌ‚(Y > 2) as a function of x₁= life events index, at the two levels of x₂= SES. Interpret effects.

Table 7.5:

Mental Impairment by SES and Life Events Life Life SES Mental Events Mental SES Events Subject Impairment Subject Impairment X2 X2 X1 Well 21 Mild 2 Well 22 Mild 3 Well 3 4 23 Mild 3 Well 3 24 Mild 4 Well 2 25 Moderate Well Well 26 Moderate 4 27 Moderate 3 Well 3 28 Moderate Well 3 29 Moderate 10 Well 30 Moderate 4 1 Well 31 Moderate 3 11 12 Well 2 32 Impaired Impaired Impaired Impaired Impaired Impaired Impaired Impaired Impaired 13 Mild 5 33 2 14 Mild 34 6. 15 Mild Mild 3 35 5 36 4 16 17 Mild 37 4 18 Mild Mild 38 19 39 20 Mild 5 40 1 "0, low; 1, high.