Question

use the following results from a test for marijuana use, which is provided by a certain drug testing company. among 148 subjects with positive test results, there are 29 false positive results. among 159 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

Explanation:

Step1: Calculate true - positive results

True - positive results = Positive results - False - positive results. Given positive results = 148 and false - positive results = 29, so true - positive results = $148 - 29=119$.

Step2: Calculate true - negative results

True - negative results = Negative results - False - negative results. Given negative results = 159 and false - negative results = 4, so true - negative results = $159 - 4 = 155$.

Step3: Calculate total number of subjects

Total number of subjects= True - positive+False - positive+True - negative+False - negative. Substitute the values: $119 + 29+155 + 4$.
$119+29 = 148$, $148+155=303$, $303 + 4=307$.

Answer:

307