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Assertiveness in disabled adults. A disabled person’s acceptance of a disability is critical to the rehabilitation process. The Journal of Rehabilitation (September 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 E(y) = β0 + β1×1 + β2×2 + β3×3, where
E(y) = β0 + β1×1 + β2×2 + β3×3, where x1 = Acceptance of disability (AD) score x2 = Age (years) x3 = Length of disability (years)
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Order Paper Now(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 α = .05.
 (b) Test the hypothesisH0: β2 = 0 againstHa: β2
= 0. Use α = .05. Give the conclusion in the words of the problem.
(c) Test the hypothesis H0: β3 = 0 against Ha: β3 > 0. Use α = .05. Give the conclusion in the words of the problem.
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