numeric
Positive predictive value of a screening test
Statistics & Inference · Probability Puzzles · medium · Reported interview question · 10 min
A condition affects 1% of a population. A test has 90% sensitivity and 95% specificity. If a randomly selected person tests positive, what is the probability they actually have the condition? Give a percentage rounded to two decimals.
Answer as a percentage, for example 12.34.
Evaluation criteria
- Uses the correct method or distribution
- Shows the calculation
- Rounds as the prompt asks
Detailed grading feedback appears after you submit.
Source
Adapted from a publicly reported interview question on DataLemur(opens in a new tab).
Your answer
%
Commas, currency symbols and a trailing percent sign are fine. Answers within ±0.15 % of the expected value are accepted.
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