Use the following results from a test for marijuana use, which is provided by a
ID: 3024291 • Letter: U
Question
Use the following results from a test for marijuana use, which is provided by a certain drug testing company. Among
147147
subjects with positive test results, there are
2727
false positive results. Among
152152
negative results, there are
44
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
nothing.
b. How many subjects did not use marijuana?
A total of
nothing
subjects did not use marijuana.
c. What is the probability that a randomly selected subject did not use marijuana?
The probability that a randomly selected subject did not use marijuana is
nothing.
Explanation / Answer
Consider:
a)
299 [ANSWER]
*****************
b)
135 [ANSWER]
******************
c)
P = 135/299 = 0.451505017 [ANSWER]
Test Uses Does not Use Total Positive 120 27 147 Negative 44 108 152 Total 164 135 299