The test to detect the presence of a liver disorder is 98% accurate for a person having the disease and 97% accurate for a person not having the disease. If 3.5% of the people in a given population actually have the disorder, what is the probability that a randomly chosen person gets an incorrect diagnosis?

Question

anonymous · Answer

Please Help, Im stuck on this online Alg 2 class and me and math are not friends.. Can someone help me out?

ganeshie8 · Answer

draw the probability tree

ganeshie8 · Answer

If 3.5% of the people in a given population actually have the disorder

anonymous · Answer

what is a probability tree?

ganeshie8 · Answer

|dw:1396446211951:dw|

amistre64 · Answer

i do a table ...

ganeshie8 · Answer

did u skip the class, or "probability tree" is not part of ur syllabus ha ?

ganeshie8 · Answer

we can do contingency table also

anonymous · Answer

This is making no sense to me

anonymous · Answer

Its a recovery class online, when I did the tutorial it didn't give me notes on this.... -_-

ganeshie8 · Answer

$\large  

\begin{array}{|l|l|}
\hline
Test~result&has ~disease& no~ disease\
\hline
Positive&&\
\hline
 Negative& &\
\hline

\end{array}
$

ganeshie8 · Answer

fill in the table

ganeshie8 · Answer

the test is  98% accurate for a person having the disease

ganeshie8 · Answer

that means, If the person really has a disease, then :
the test shows positive 98% of the time
the test shows negative 2% of the time


right ?

ganeshie8 · Answer

$
\large  

\begin{array}{|l|l|}
\hline
Test~result&has ~disease& no~ disease\
\hline
Positive&\color{red}{98\%}&\
\hline
 Negative& \color{red}{2\%}&\
\hline

\end{array}

$

ganeshie8 · Answer

97% accurate for a person not having the disease

that means if the person has no disease, then :
the test shows positive 3% of the time
the test shows negative 97% of the time

ganeshie8 · Answer

$
\large  

\begin{array}{|l|l|}
\hline
Test~result&has ~disease& no~ disease\
\hline
Positive&\color{red}{98\%}&\color{red}{3\%}\
\hline
 Negative& \color{red}{2\%}&\color{red}{97\%}\
\hline

\end{array}

$

ganeshie8 · Answer

see if the table makes sense

anonymous · Answer

you just spoke in a different language to me...

anonymous · Answer

* to me in

anonymous · Answer

Thanks for your help but I got a whole test to do and I don't what to bother you with all those questions... @ganeshie8

ganeshie8 · Answer

wats ur native language ?

anonymous · Answer

English lol

anonymous · Answer

Math was always my weakest subject...

ganeshie8 · Answer

lol okay, try again and see if the table makes sense,
once you're are at peace with the table, rest is very easy to do...

ganeshie8 · Answer

btw, the table only captures the information GIVEN already to us in the question

anonymous · Answer

Honestly I just guessed and passed that question, I have a deadline that I have to meet to graduate... im on a different question Lol

ganeshie8 · Answer

cool :) good luck wid remaining questions !!

anonymous · Answer

Thanks, I really appreciate your effort in trying to help me :)

ganeshie8 · Answer

np :)

anonymous · Answer

Are you like a teacher in math or something?

ganeshie8 · Answer

noo, im also weak in math... trying to catchup....

anonymous · Answer

Really??

anonymous · Answer

You fooled me lol

ganeshie8 · Answer

hahah i try not to :)

anonymous · Answer

Lol where do you live?

ganeshie8 · Answer

india, wbu ?

anonymous · Answer

India?? wow that's really cool, I live in Florida...

anonymous · Answer

Would you mind helping me out one more time? @ganeshie8