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ONce someone asks I will post a screencap
ok one sec
what are your thoughts on this?
Im looking for a working pen one moment
okay let me write down the problem
sorry i just found my paper
Okay so I think I need to look at the comlums and ad the two row in each colum together to see what number I must divde by?
Well I would say so I have numbers to add together for the bottom row of my colum
all they want you to do is rearrange the given info into a table then add up the rows to get the row totals afterwards, add up the columns to get the column totals no division is done at all
really? Im having trouble so I watched a kahn academy video and they said to divide! Now I am really confused
you divide if they wanted RELATIVE frequencies
okay I need your help
normal frequencies are counts (whole numbers) relative frequencies are percentages, fractions or decimal form
okay what about two way frequecies
how many men like playing sports
so "11" goes in the "Men" row and "Playing sports" column
the other values are done in a similar way
really thats it?
again they just want normal frequencies
so the answer is B
notice how they have "row totals" and "column totals" do you see how those numbers were formed?
Okay can you double check my answer for the next?
now notice how the keyword "relative frequency" comes up
it's not a simple count anymore
that "relative" changes everything
Oh do I divide with this one?
yes division will play a part now
okay let me take a crack at it. See I think I watched a video on realative
yeah it sounds like it too
I think its b!!!!!
because I was dividing the number in the colum/row by the colum total In the chart I made with they numbers I was given and got the same answers in the chart B!
Notice there are 26 people who are in high school and like action this is out of 128 people total (see table in choice A or you can add up all the numbers)
so the relative frequency of those who are in high school and love action movies is 26/128 = 0.203125 that rounds to 0.20
in a normal frequency table, "26" goes in the "high school" and "action" column in a relative frequency table, "0.20" goes in the "high school" and "action" column (since 26/128 is roughly 0.20)
and like before, the other relative frequencies are calculated in a similar way
so you divide by 128? I divded by 46
it was that comlum total and I listened incorrectly
oh im dividing by 128 and i get it now its D
well when they mean "relative" without specifying anything further, they mean relative to the entire group so 26/128 = 0.20 roughly means that approximately 20% of the entire group is in high school and likes action movies if it said "relative to action movies" then it would work. Or if it said "of those who like action movies, what is the relative frequency of those in high school?" then it would work
yeah it's D
okay ready next one
Can you teach me what this means?
let me look it over
I want to say B for some reason because they didn't say relative
I'm still thinking on this one
okay take your time
ok hopefully I have the right interpretation
they ask "Which of the following is a two-way conditional frequency table for gender?" so in a sense, they want to compare the results between genders (to see which percent like Aspen for instance)
it might help to take that original table and convert it to a frequency table (not a relative frequency table)
let's say there are 100 people how many of those 100 people are male and like aspen?
22% of 100 = ???
how many females like aspen?
so 22+16 = 38 people like aspen
okay aand 63 people like nyc
22 males like aspen 38 people total like aspen if you just focus on aspen (ignore the other location), what is the percentage of males who like aspen?
44% of males enjoy aspen
ignore the other location
so is it still 22 or is it 44 i multiplied by 2 because it would make sense if there was one hundred men 44 enjoy aspen
22 males like aspen 38 people total like aspen 22/38 = ??
22/38 = 0.57894736842106 which rounds to 0.58
so 58% of the people who like aspen are male
fill in the blank ____ percent of the people who like aspen are female
is it A?!?!?!?! eeeeeeeeeee
that's assuming my interpretation was correct
okay next one lol so srry but I am learning a ton
that was the question and options
no clue I need to learn that fancy vocabulary
so all of the terms are unfamiliar?
if you tell me what each word means I might be able to make an educated guess
Ok let's make up an example
Let's say we have males and females and let's say we want to know if they like coke or pepsi I'm just going to randomly make up data Males: 12 like coke, 10 like pepsi Females 8 like coke, 13 like pepsi
okay I get that so far
go ahead and fill out the table (click the pencil to draw on my drawing)
the 86 is incorrect, but everything else looks good
you only add either the row totals OR the column totals (pick one)
the numbers I'm circling are called `joint frequencies` |dw:1435452635430:dw|
they are frequencies (whole numbers, counts of something) the "joint" means the frequencies represent 2 different things. For instance, the 12 represents "male" and "coke" at the same time think of "joint" as in "joint bank account" (2 or more people own/access it) or as in "joints in your body" (connecting 2 bones together)
now if you divide every value by the total number of people (43), you will get this |dw:1435452804260:dw|
okay i see how you got that
these circled values are called `joint relative frequencies` |dw:1435453025373:dw| they are basically `joint frequencies` but divided by the total (in this case 43)
for example, 0.28 is a `joint relative frequency` it means "28% of the entire group is male and likes coke"
notice how 43*.28 = 12.04 which is pretty close to the original 12
yeah you just rounded
ok more terms
okay throw them at me
these are marginal frequencies |dw:1435453144401:dw|
they are in the margins (off to the side, think margins on a paper) and they are frequencies (whole number counts)
wait does frequency=whole number counts=?
frequency is just a fancy way of saying how many times it happens
so yeah it's a count of something
okay sorry continue
marginal relative frequencies are basically the same as joint relative frequencies just now you focus on the margins |dw:1435453312087:dw|
okay @jim_thompson5910 sorry if I am a little spotty dont worry I am still here
so I m thinking of the answer to the actual question now
what are you thinking so far
it means a piece of, or percentage of
it's like a proportion
okay I am making an educated guess here.. is it B? since its a decimal
and why is it not D?
hmmm... I think it's B becuase it represents two things, female students and dancing, but then again it could be marginal
is that value in the margins?
the colum next to it is the total value of the margin
so it can't be a marginal relative frequency
okay so my educated guess was right!
post in a new question. I'm lagging really badly since there's so much on this post