# Question

Refer to Exercise 16.18.

a. Test whether the equations relating verbalization skill to age for the four socioeconomic groups are parallel lines.

b. Are there significant differences in the mean verbalization scores for the four groups? Test this hypothesis using α = .05.

c. Place 95% confidence intervals on the mean adjusted verbalization scores for the four groups.

a. Test whether the equations relating verbalization skill to age for the four socioeconomic groups are parallel lines.

b. Are there significant differences in the mean verbalization scores for the four groups? Test this hypothesis using α = .05.

c. Place 95% confidence intervals on the mean adjusted verbalization scores for the four groups.

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