Question

need help with a probabilility question

Answer 1

98% of those who have HIV test positive while 1.5% who do not have HIV test positive. Heterosexuals without risk of HIV have an infection rate of .02%

What is the probability that a random person in this group would test positive?

Answer 2

sorry it should say 99.8%

Answer 3

I don't think this question has enough information.

Answer 4

so, 99.8% of HIV positive patients test positive
1.5% who are non HIV positive still test positive
and .02% of Heterosexuals are HIV positive

What is the probability that a random person in this group would test positive?

Answer 5

so sorry, I have never used this

I will type in exactly what I have

Regarding the Elias Test for HIV.

Assume the test returns a positive result for 99.8% of those with the HIV virus and that when the test is given to those not infected it returns a positive result 1.5% of the time. Heterosexuals without specific risk factors for HIV have an infection rate of about .02%.

What is the probability that a random person in this group would test positive?

Answer 6

anybody got this?

Answer 7

This is a conditional probability, you have to use bayes formula, also draw a tree diagram to make sense of the probabilities and its compliments

Answer 8

not sure I know what you are talking about?

Answer 9

I will have to check in later

Answer 10

use Bayes formula of reverse probability ans will be 196/15193