Answer the folloing…

Drug Testing

A company has 20,000 employees to drug test. We are going toassume there are 500 actively using illegal drugs. The drug testthey are going to administer is 95% accurate.

	Test is Positive	Test is Negative	Total
Actively Using
Not Using
Total			20,000

If someone tests positive for drugs, what is the probability theperson is actually NOT taking drugs?

If someone tests negative for drugs, what is the probability thetest is wrong?

According to WEBMD home pregnancy tests are about 99% accurate,if you do the test first thing in the morning.

Let’s take a look at 1000 women who take a home pregnancy test.We are going to assume that 30% of them are actually pregnant.

  

	Test is Positive	Test is Negative	Total
Actually Pregnant
Not Pregnant
Total			1000

What is the probability for someone who is pregnant will receivea positive test?

What is the probability of someone not being pregnant eventhough they have a positive test result?

If someone receives a negative test result, what is theprobability they are actually pregnant?

create a tree diagram for the same scenarios and respond to thequestions below

Drug Testing

A company has 20,000 employees to drug test. We are going toassume there are 500 actively using illegal drugs. The drug testthey are going to administer is 95% accurate.

According to WEBMD home pregnancy tests are about 99% accurate,if you do the test first thing in the morning.

Let’s take a look at 1000 women who take a home pregnancy test.We are going to assume that 30% of them are actually pregnant.