A. A medical research team wished to evaluate a proposed screening test for Alzheimer's disease. The test was given to a random sample of 450 patients with Alzheimer's disease and an independent random sample of 500 patients without symptoms of the disease. The two samples were drawn from populations of subjects who were 65 years of age or older. The results were as follows: 4 I. II. III. a IV. Find sensitivity and interpret your results Find specificity and interpret your results Find negative predictive value (NPV) and interpret your results. Assume P(D)=11.3% Find positive predictive value and interpret your results. Assume P(D)=11.3% Note: P(D) is the prevalence of the disease. Test result Positive (T) Negative (T) Total Alzheimer's diagnosis No (D) 5 495 500 Yes (D) 436 14 450 Total 441 509 950

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A. A medical research team wished to evaluate a proposed screening test for Alzheimer's disease.
The test was given to a random sample of 450 patients with Alzheimer's disease and an
independent random sample of 500 patients without symptoms of the disease. The two
samples were drawn from populations of subjects who were 65 years of age or older. The
results were as follows:
Find sensitivity and interpret your results
Find specificity and interpret your results
Find negative predictive value (NPV) and interpret your results. Assume P(D)=11.3%
Find positive predictive value and interpret your results. Assume P(D)=11.3%
Note: P(D) is the prevalence of the disease.
섹
I.
II.
III.
IV.
BTV.
Test result
Positive (T)
Negative (T)
Total,
Alzheimer's diagnosis
No (D)
Yes (D)
436
14
450
5
495
500
Total
441
509
950
Transcribed Image Text:A. A medical research team wished to evaluate a proposed screening test for Alzheimer's disease. The test was given to a random sample of 450 patients with Alzheimer's disease and an independent random sample of 500 patients without symptoms of the disease. The two samples were drawn from populations of subjects who were 65 years of age or older. The results were as follows: Find sensitivity and interpret your results Find specificity and interpret your results Find negative predictive value (NPV) and interpret your results. Assume P(D)=11.3% Find positive predictive value and interpret your results. Assume P(D)=11.3% Note: P(D) is the prevalence of the disease. 섹 I. II. III. IV. BTV. Test result Positive (T) Negative (T) Total, Alzheimer's diagnosis No (D) Yes (D) 436 14 450 5 495 500 Total 441 509 950
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