Question

Quetion 17 of Question 17 5 points Save Aew Resuls from a marijina drug test staly showed 143bjswitiag test resalts including 24 falise positive reuls Thene wone 157 give e alinghe ege Wi that a randomly selected subject did not use marijuana? 0593 O 0533 O 0523 0.477

Answer 1

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Probability that a randomly selected subject didn't use marijuana is:

+ive = 143

false + ive = 24

-ive = 157

false -ive = 3

Therefore, the table looks like:

Actual --> yes no total

Observed True 119    24 143

Observed False 3   154 157

Total 122 178 300

P(randomly selected subject didn't use marijuana)

= 24+154 / 300

= 178/300

= .5933 or option 1st : 0.593