Harder Base Rate Question

[Ectezus]

3.We also know that the test, if you don't have cancer, will give a false positive 1% of the time.

Of the 9,900 who do not have cancer 990 will have positive test.

I think you're using 10%

When you do use 1% the outcome will be 50% instead of 11%

 

[Stormy]

1% of 9900 is 99, not 990.

yes, when I wrote it up for you, I noticed my mistake. I guess my math is not that great in the middle of the night. I edited the post. The correct answer is 2%

 

[Mystman]

99 is 2% of 198

In this sample a positive test has an accuracy of 2% correction

99 is 50% of 198

You should go to bed.

(or not.. I guess you meant the initial 11% was typed in the middle of the night?.. oh well nvm, the number is not that important ^^ )

 

[Stormy]

99 is 50% of 198

You should go to bed.

(or not.. I guess you meant the initial 11% was typed in the middle of the night?.. oh well nvm, the number is not that important ^^ )

lol