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For Questions 8-10 consider this hypothetical information: It can...

For Questions 8-10 consider this hypothetical information: It can be difficult to differentiate mild dementia from normal memory loss or the temporary effects of illness and/or medications in the elderly. Suppose a study used a QuickieTest to save money. The table below compares the results of this test among a group of nonimpaired elderly to test results from a group with mild dementia (as diagnosed by a gold standard).

No. of items checked on QuickieTestPercent of elderly with mild dementia who checked . . .Percent of elderly with NO dementia who checked . . .00%22%10%28%21%16%32%16%410%12%518%6%625%0%724%0%820%0%

Q 8

Question 8

If the researchers used a cutoff of more than five items checked on the QuickieTest as a positive test for mild dementia, what would be the sensitivity of the test?

Select one:

a. 6%

b. 31%

c. 69%

d. 94%

Q 9

Question 9

If the researchers used a cutoff of more than four items checked on the QuickieTest as a positive result for mild dementia, what would be the specificity of the test?

Select one:

a. 100%

b. 94%

c. 13%

d. 0%

Q 10

Question 10

If 50% of the population being screened has mild dementia, what is the positive predictive value for a cutoff of more than four checked questions being considered a positive test?

Select one:

a. 6%

b. 13%

c. 87.8%

d. 93.5%

e. Cannot be computed from this data

Answer & Explanation
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