b. Using Bayes\' Theorem, when a person tests negative, determine the probabilit

Question

b. Using Bayes' Theorem, when a person tests negative, determine the probability that a person is not infected A clinical microbiology laboratory compared the frequency of isolation of DNA hybridization probe to a culture method for the sexually transmitted bacterium Neisseria gonorrhaeae. The frequency of isolation from clinical specimens was historically 10%. The lab ran 100 split samples, and the results are presented in the table 3- below. (20 pts) Table. Comparison of the Distribution of Negative and Positive Results for the DNA Probe and Culture Methods. Culture Results DNA Probe Results Positive Negative Positive Negative 1) Calculate the positive predictive value?

Explanation / Answer

Formula for PPV = A/A+B *100

where,

A = True positive = 9
B = False Positive = 2

So, Positive Predictive value = 9/9+2 = .8181

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