#stats

171 messages · Page 1 of 1 (latest)

covert umbra
wispy elbow
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which part

covert umbra
wispy elbow
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so the sd (standard deviation i cba to type) is 9

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an outlier is 2 sd from the mean

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so in this case it would be 18 away from the mean

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so in total a range of +- 18 from the mean

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this means the range of the data would be 36

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since its 50 there are values that are outliers

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as they don’t fit the range of non outlying data (36)

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if there was no outliers the range would be 36

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if that makes sense

covert umbra
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hmm

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ohhhhhhhhh

covert umbra
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wb the other parts

wispy elbow
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so part b

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let me read

wispy elbow
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if not then

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calculate the mean

covert umbra
wispy elbow
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fine

covert umbra
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ohhh

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yh the way u explained was perf

wispy elbow
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ok cool

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so you’d calculate the mean first cause by definition an outlier is 2sd away from the mean

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so in this case the mean is (frequency times by x)

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/ total frequency

covert umbra
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yeah

wispy elbow
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so 0p+30q/p+q

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which is just 30q/p+q

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if 30 is an outlier then 30 is greater then the mean + 2sd

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so 30> 2(9) + 30p/p+q

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then just rearrange it to make p the subject

covert umbra
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i see

wispy elbow
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12>30q/p+q
12p + 12q > 30q
12p>18q
2p>3q
p>3/2q

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er wait

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where did i go wrong

covert umbra
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it looks fine

wispy elbow
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weird

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i don’t see how that relates

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how does that convert into p>4q

covert umbra
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i’m not sure

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?

wispy elbow
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so 30 will be an outlier if p>4q

wispy elbow
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oh ffs

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that’s why

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let me edit

covert umbra
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kk

wispy elbow
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i accidentally did 30p not 1

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q

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okay then p is in that inequality and the one given (p>4q)

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so we know that p>4q>3q/2 is true

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so 30 must follow p>4q

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does that make sense m?

covert umbra
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not really

wispy elbow
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okay so

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we just worked out p>3/2q right

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you understand that

covert umbra
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yeah

wispy elbow
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you notice how p is in both inequalities

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p>4q and p>3p/2

covert umbra
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yh

wispy elbow
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you can combine them to make it p>4q>3q/2

covert umbra
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how do you know which order to put it in btw

wispy elbow
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we just worked out that if 30 is an outlier then p>3q/2

wispy elbow
covert umbra
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oh nvm

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yh

wispy elbow
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my bad lol

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so anyways

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we worked out that if 30 is an inequality for that set of data then p>3q/2

covert umbra
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mhm

wispy elbow
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so p>4q aswell since they gave us that

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so for p>3q/2 p must also be p>4q

covert umbra
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hmm

covert umbra
wispy elbow
covert umbra
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yeah

wispy elbow
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it’s just that

covert umbra
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do we just say p>4q because they gave it then?

wispy elbow
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i think so?

covert umbra
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fairs

wispy elbow
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yeah you do

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it tells you to use that

covert umbra
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kk

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thx jb

wispy elbow
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all good

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you good with the other parts?

covert umbra
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i mean

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can we just go through them

wispy elbow
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sure

thick shuttle
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Average stats experience

wispy elbow
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🤣🤣

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this is aqa that’s why

covert umbra
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nah ocr

wispy elbow
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ok part c it tell you to use q=3

covert umbra
wispy elbow
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so since p>4q
p>12

thick shuttle
covert umbra
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not for all questions

wispy elbow
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so if we calculate the mean it’s 30(3)/p+3

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which is 90/p+3

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since p>12

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ok i cba to scroll up more

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okay so an outlier is 2 sd from the mean

covert umbra
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yea

wispy elbow
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so the range here is 30

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if the range is > then the mean+2sd

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then there are outliers

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if you understood from part a

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so 30> 90/(p+3) + 18

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12>90/(p+3)

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so in part b we worked out p>4q

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p>12

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let’s use 13 i guess since that’s higher then 12

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sub that in

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12>90/16

covert umbra
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ohh

wispy elbow
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90/16 that’s what

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er

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  1. something
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,w 90/16

oblique jasperBOT
wispy elbow
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yeah so the range is higher then the mean +2sd
so it’s possible for there to be outliers

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12>5.625

covert umbra
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great

wispy elbow
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for counter example do you only need 1 example?

covert umbra
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yeah

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i’m pretty sure

wispy elbow
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i’m confused the data they give you has a standard deviation of 12.25

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yeah idk how to do part d sorry

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it don’t make sense to me

covert umbra
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it’s okay

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thank you for the other parts tho

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ur rlly good at explaining

wispy elbow
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all good ❤️

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you can always @ me here or in the other server

covert umbra
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@thick shuttle

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care to explain

thick shuttle
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Huh

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Are you trying to get me to do stats

covert umbra
thick shuttle
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Ew

covert umbra
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when you get 100% in a year you’ll be happy

wispy elbow
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makes no sense to me

thick shuttle
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Do i need previous parts

wispy elbow
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i don’t think so

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you won’t

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well just the top part that an outlier is 2sd from the mean

covert umbra
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wifibad is cooking

wispy elbow
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i’ve been checking every minute

covert umbra
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good point

thick shuttle
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I think I'm being way too general

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Out here finding integer solutions to an equation with 3 unknowns

covert umbra
thick shuttle
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I mean i need to find 3 integers that satisfy the equation first

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Yeah I'm overcomplicating it

tardy hearth
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come on stats man

covert umbra
thick shuttle
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I didn't spent that whole time doing it ok

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Also i started off with the assuming that mean(x) could be any number between 12-18 as all the data would still be within 2 standard devs of the mean

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Which made things unnecessarily complicated when just trying to find one counterexample rather than a general one