Question

The data represent the results for a test for a certain disease. Assume one individual from the group is randomly selected. Find the probability of getting someone who tests negative, given that he or she did not have the disease.

The individual actually had the disease
Yes No
Positive 135 11
Negative 99 145

Answer 1

0.9295 = 92.95% probability of getting someone who tests negative, given that he or she did not have the disease.

Explanation:

A probability is the number of desired outcomes divided by the number of total outcomes.

In this question:

11 + 145 = 156 people did not have the disease.

Out of those, 145 tested positive. So

`p = (145)/(156) = 0.9295`

0.9295 = 92.95% probability of getting someone who tests negative, given that he or she did not have the disease.