A disabled person's acceptance of a disability is critical to the rehabilitation process. The Journal of Rehabilitation (Sept. 1989) published a study that investigated the relationship between assertive behavior level and acceptance of disability in 160 disabled adults. The dependent variable, assertiveness (y), was measured using the Adult Self Expression Scale (ASES). Scores on the ASES range from 0 (no assertiveness) to 192 (extreme assertiveness). The model analyzed was
The regression results are shown in the table.
a. Is there sufficient evidence to indicate that AD score is positively linearly related to assertiveness level, once age and length of disability are accounted for? Test using a = .05
b. Test the hypothesis H0: ß2, = 0 against Ha: ß1, ß0. Use a = .05. Give the conclusion in the words of the problem.
c. Test the hypothesis H0:ß3, = 0 against Ha: ß3 > 0. Use α = .05. Give the conclusion in the words of the problem.