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This is my graph
Use social media regularly Don't use social media Younger than 18 16 4 Older than 18 11 9
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
@dan815 @iambatman @triciaal
lets start with the first question
first find the totals http://prntscr.com/7cj8yl
Let A = Use social media regularly Let B = Younger than 18 P( A | B) = 16/20 P(B|A) = 16/27
i understand up to now
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
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
so we only look at that top row
so the top row and 1s2 colum?
younger than 18 and use social media
@perl @perl @perl @perl dont leave
YAY ur back! :)
right, top row and first colmun is P(A|B)
P(A|B) corresponds to top row and first colmun also we can express it as P(A|B) =P(A∩B) / P(B)
what does p(b line a) mean. it means
P(B|A) says to look in only first column, first row
so what exactly does that mean?
does it mean it all out of total
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
can you look over the answer I wrote?
what did you write
P(B | A) means probability of those under 18 who use social media regularly out of the total people that use social media regularly
P(A | B) : This probability means means probability of those under 18 who use social media regularly out of all the people under 18
do you agre that I defined A = "those who use social media regularly"
am i right?
its kind of hard to say, its a bit confusing what you wrote for the second one
P(A | B) : This means probability of those under 18 who use social media regularly out of all the people under 18
i edited that
is the first one right?
P(A|B): probability that a person who is younger than 18 uses social media regularly.
P(B|A): Probability that a person who uses social media regularly is younger than 18.
@perl can you help me with the second one please?
THANKS FOR ALL THE HELP