15.3. A sample of 54 elderly men take a psychiatric examination to determine whether symptoms of senility
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15.3. A sample of 54 elderly men take a psychiatric examination to determine whether symptoms of senility are present. A subtest of the Wechsler Adult Intelligence Scale (WAIS) is the explanatory variable. The WAIS scores range from 4 to 20, with a mean of 11.6.
Higher values indicate more effective intellectual functioning.
Software shows the following results:
(a) Show (i) ˆP(y = 1) = 0.50 at x = 7.2, (ii) ˆP(y = 1) 0.50 for x > 7.2.
(b) Estimate the probability of senility at x = 20.
(c) The fit of the linear probability model is ˆP(y = 1) = 0.847 − 0.051x. Estimate the probability of senility at x = 20. Does this make sense?
(d) TestH0: β = 0 againstHa: β = 0.Report and interpret the P-value.
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Related Book For 
Statistical Methods For The Social Sciences
ISBN: 9781292220314
5th Global Edition
Authors: Alan Agresti
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