Choose a row and column and compare P(A | B) with P(B | A). Explain what each probability means in the context of the situation and data you collected.

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- pink.1d

- schrodinger

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- pink.1d

This is my graph

- pink.1d

table***

- pink.1d

Use social media regularly Don't use social media
Younger than 18 16 4
Older than 18 11 9

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## More answers

- pink.1d

- pink.1d

also: Compare P(A∩B) with P(A∪B), and explain what each probability means in the context of the situation and data you collected. SAME TABLE posted above

- pink.1d

- perl

lets start with the first question

- pink.1d

okay:)

- perl

first find the totals
http://prntscr.com/7cj8yl

- perl

Let A = Use social media regularly
Let B = Younger than 18
P( A | B) = 16/20
P(B|A) = 16/27

- pink.1d

i understand up to now

- pink.1d

i dont get what they mean when it says ' Explain what each probability means in the context of the situation and data you collected.' i dont know how to answer that. i know how to find the answer but i m not sure how to answer that

- perl

P(A | B) means probability use social media regularly given that we only look at people who are younger than 18
http://prntscr.com/7cja04
Or another way to say it, of people who are younger than 18 what is probability that randomly selecting one uses social media

- perl

so we only look at that top row

- pink.1d

so the top row and 1s2 colum?

- pink.1d

1st*

- pink.1d

younger than 18 and use social media

- pink.1d

YAY ur back! :)

- perl

right, top row and first colmun is P(A|B)

- perl

P(A|B) corresponds to top row and first colmun
also we can express it as
P(A|B) =P(A∩B) / P(B)

- pink.1d

what does p(b line a) mean. it means

- perl

P(B|A) says to look in only first column, first row

- pink.1d

so what exactly does that mean?

- pink.1d

im confused

- pink.1d

does it mean it all out of total

- perl

If we define http://prntscr.com/7cjcnn
P(B|A) says to look in only first column A
P(A|B) says to look only in first row B

- pink.1d

can you look over the answer I wrote?

- perl

what did you write

- pink.1d

P(B | A) means probability of those under 18 who use social media regularly out of the total people that use social media regularly

- pink.1d

P(A | B) : This probability means means probability of those under 18 who use social media regularly out of all the people under 18

- perl

do you agre that I defined A = "those who use social media regularly"

- pink.1d

am i right?

- perl

agree*

- pink.1d

or wrong

- perl

its kind of hard to say, its a bit confusing what you wrote for the second one

- pink.1d

P(A | B) : This means probability of those under 18 who use social media regularly out of all the people under 18

- pink.1d

i edited that

- pink.1d

is the first one right?

- pink.1d

- perl

P(A|B): probability that a person who is younger than 18 uses social media regularly.

- perl

P(B|A): Probability that a person who uses social media regularly is younger than 18.

- perl

http://prntscr.com/7cjfig

- pink.1d

@perl can you help me with the second one please?

- pink.1d

NEVERMIND

- pink.1d

THANKS FOR ALL THE HELP

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