Neco Model Questions Vol1 2022 Biology Question 50

Practice objective / multiple choice question 50 from the 2022 Neco Model Questions Vol1 Biology examination.

Neco Model Questions Vol1 2022 Biology Objective / Multiple Choice Hard Difficulty
Question 50 NECO_MODEL_QUESTIONS_VOL1 • 2022 • BIOLOGY • objective

A diagnostic test for disease X has a sensitivity of 92 % and a specificity of 87 %. In a population where the prevalence of disease X is 5 %, (a) calculate the positive predictive value (PPV) of the test. (b) If all individuals who test positive are subsequently examined with a confirmatory test that has 100 % specificity, what proportion of the total population will be correctly identified as diseased after both tests? Express both answers as percentages rounded to one decimal place.

Answer Options

A. PPV = 31.5%; correctly identified = 5.2%
B. PPV = 27.1%; correctly identified = 5.0%
C. PPV = 22.8%; correctly identified = 4.0%
Correct Answer D. PPV = 27.1%; correctly identified = 4.6%
Correct Answer
D
Correct Option:
PPV = 27.1%; correctly identified = 4.6%

About This Question

This is Neco Model Questions Vol1 2022 Biology Question 50. It is one of the objective questions from the 2022 Neco Model Questions Vol1 Biology examination.

Difficulty level: Hard .

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