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A diagnostic test for a rare genetic condition has sensitivity = 0.98 (correctly identifies 98% with the condition) and specificity = 0.95 (correctly identifies 95% without the condition). In a screening population where only 0.5% of people have the condition, what is the probability that a randomly selected person who tests positive actually has the condition? (This is the positive predictive value or PPV.)
A diagnostic test for a rare genetic condition has sensitivity = 0.98 (correctly identifies 98% with the condition) and specificity = 0.95 (correctly identifies 95% without the condition). In a screening population where only 0.5% of people have the condition, what is the probability that a randomly selected person who tests positive actually has the condition? (This is the positive predictive value or PPV.)