Question

use the following results from a test for marijuana use, which is provided by a certain drug testing company. among 142 subjects with positive test results, there are 20 false - positive results. among 154 negative results, there are 2 false negative results. complete parts (a) through (c). (hint: construct a table.)
a. how many subjects were included in the study?
the total number of subjects in the study was

Explanation:

Step1: Calculate true - positive results

The number of positive test results is 142 and the number of false - positive results is 20. So the number of true - positive results is $142 - 20=122$.

Step2: Calculate true - negative results

The number of negative test results is 154 and the number of false - negative results is 2. So the number of true - negative results is $154 - 2 = 152$.

Step3: Calculate total number of subjects

The total number of subjects is the sum of true - positive, false - positive, true - negative and false - negative results. That is $122+20 + 152+2$.
$122+20+152 + 2=(122+20)+(152 + 2)=142+154 = 296$.

Answer:

296