Question

Nathan had an infection, and his doctor wanted him to take penicillin. Because Nathan’s father and paternal grandfather were allergic to penicillin, Nathan has a 75% chance of having the same allergy. The doctor performed a skin test to see whether Nathan would react to it. The test is 98% accurate. If the test predicts that Nathan is not allergic to penicillin, what is the probability after the test that Nathan is not allergic to the drug?

0.1135

0.2450

0.9423

0.9932

Answer 1

I know that it isn't the first one or the last from what a friend said. Plato also said they were both wrong. Hopefully, I can figure this out. I believe it is the third one, but I'm not too sure. Could anyone tell me if I'm right? I have 5 of these questions. I have tried all the answers and they are all "wrong."

Answer 2

@ThisGirlPretty @Eiwoh2 @Elsa213 Could you tell me if I'm right or not?

Answer 3

@will

Answer 4

Id say it is either B or C. Cant confirm.

Answer 5

It should be B :D

Answer 6

Thanks @ThisGirlPretty

Answer 7

On discovering that her family had a 70% risk of heart attack, Erin took a treadmill test to check her own potential of having a heart attack. The doctors told her that the reliability of the stress test is 67%. What is the probability that Erin will not have a heart attack and the test predicts that she will?
0.099
0.201
0.231
0.469

Answer 8

No problems :D

Answer 9

It's B or D that I know of

Answer 10

It's B, right?

Answer 11

Yes :D

Answer 12

If it is between B or D, i would say B is correct, yes

Answer 13

Yay!!

Answer 14

I thought it was beteween B or C lol. It would be B either way

Answer 15

Jason inherited a piece of land from his great-uncle. Owners in the area claim that there is a 45% chance that the land has oil. Jason decides to test the land for oil. He buys a kit that claims to have an 80% accuracy rate of indicating oil in the soil. What is the probability that the land has no oil and the test shows that it has oil?
0.09
0.11
0.36
0.44

Answer 16

Uh, can you do these questions seperatly? We dont want the thread getting too long

Answer 17

Sure

Answer 18

Thank you.

Answer 19

B: 0.11