Question

use the following results from a test for marijuana use, which is provided by a certain drug - testing company. among 144 subjects with positive test results, there are 22 false - positive results. among 151 negative results, there are 4 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 295.
b. how many subjects did not use marijuana?
a total of □ subjects did not use marijuana.

Explanation:

Step1: Define types of results

Positive results = 144, Negative results = 151. False - positive = 22, False - negative = 4.

Step2: Calculate true - positive and true - negative

True - positive = 144 - 22=122. True - negative = 151 - 4 = 147.

Step3: Find non - users

Non - users = False - positive+True - negative.
Non - users = 22 + 147=169.

Answer:

169