Question

Find
P(subject lied | negative results)
P(negative results | subject lied)
PLEASE HELP

Answer 1

@jim_thompson5910

Answer 2

let's find P(subject lied | negative results)

Answer 3

P(subject lied | negative results) means

"the probability of the subject lying given it's a negative test result"

Answer 4

so we're given "negative results" which means we don't even need to bother with the positive result

we can even cross it out for the time being if you want

Answer 5

we focus just on the "negative results" row

Answer 6

how many negative results are there total?

Answer 7

38

Answer 8

of those, how many lied?

Answer 9

8

Answer 10

ahh do i divide that?

Answer 11

so the probability is 8/38 = 4/19

Answer 12

So, P(subject lied | negative results) = 4/19

Answer 13

do you see how to do the next one?

Answer 14

is that the same process just dealing with the two lie numbers?

Answer 15

what do you mean?

Answer 16

the 41 and 8

Answer 17

or is it both positive results numbers?

Answer 18

I'm guessing you're onto P(negative results | subject lied) now?

Answer 19

if so, then you focus on the "subject lied" column