Question

how can I use this calculator based on the diagram

Answer 1

http://stattrek.com/online-calculator/probability-calculator.aspx

Answer 2

@Directrix

Answer 3

@ganeshie8 please help me

Answer 4

First, you need to figure out P(A), P(B), and P(A ^ B) by looking at the figure.

You can use the calculator for finding the last two parts

Answer 5

P(A)=0.2
P(B)=0.1
P(A^B)=0.3

Answer 6

In the calculator page, do you see a dropdown menu for "Main goal" ?

Answer 7

yes

Answer 8

@ganeshie8

Answer 9

select the appropriate one

Answer 10

select `Find conditional probability of B, given A`

Answer 11

ok done

Answer 12

then enter the values for P(A), P(B) and P(A^B)

Answer 13

wait, your numbers are wrong

Answer 14

```
P(A)=0.2
P(B)=0.1
P(A^B)=0.3
```

Answer 15

those are wrong, try again

Answer 16

only this is correct :
`P(A^B)=0.3`

Answer 17

why is the other one wrong

Answer 18

for P(A), you must pick the entire A :

P(A) = 0.2 + 0.3 = 0.5

Answer 19

ohh ok then same for b got it

Answer 20

b is 0.4

Answer 21

Yes

Answer 22

alrigh now what :)

Answer 23

alright I got you Daniel. Ok so
P(AnB)=P(A|B)*P(B)
NOTE:P(AnB) is also written as P(AB)
P(AnB)=P(B|A)*P(A)
P(A) is the whole circle A. (.2+.3=.5)
P(B) is the whole circle B (.1+.3=.4)
S (we call this the sample) MUST EQUAL TO 1.
We know P(AB)=.3
plug in the formula above and you should get all the unknowns.