Question

use the following results from a test for marijuana use, which is provided by a certain drug test: 148 subjects with positive test results, there are 29 false - positive results. among 159 negative results, there are 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 307. b. how many subjects did not use marijuana? a total of subjects did not use marijuana.

Explanation:

Step1: Calculate true - positive results

The number of positive test results is 148 and false - positive results is 29. So the true - positive results are $148 - 29=119$.

Step2: Calculate true - negative results

Among 159 negative results, assume the number of false - negative results is $x$ (not given in the problem - statement for part b calculation). But the number of subjects who did not use marijuana is the sum of false - positive and true - negative results. True - negative results are $159 - x$. Since we are not given false - negative results value for this part, we use the fact that non - users are false - positives+true - negatives. False - positives are 29 and true - negatives are $159 - 0$ (assuming no false - negatives for simplicity as not given otherwise). So the number of non - users is $29+(159)=188$.

Answer:

188