Statistics homework

[woven forum]

<@&987246746478460948> please have a look, thanks.

[woven forum]

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[maiden harness]

Hey Pew, it's LovinLife. 🙂 What part of the question are you having difficulties with? If you elaborate a little bit more you'll get better help and a little faster too. 🙂 And nobody on here wants to take your money. We help for the love of helping people.

[clever moon]

Every single part of it lol. I don't understand it at all.to start, I need to find F

Statistics homework- WILL PAY

Statistics homework-

Sorry is that not allowed?

Statistics homework

[tacit herald]

yup, it's against our rules

we only help for free

also we won't do your homework for you, but we will teach and guide you

[clever moon]

Ok lol

Well I’m waiting for someone to teac and guide me

[tiny stone]

could u specify what's unclear to u

u said "everything". so we have to start at explaining the symbols?

[clever moon]

Yes

I have statcrunch if a special calculator is necessary, I just need to know where to input what

[tiny stone]

so u dont know what that sigma symbol means yet? do u understand the task description itself?

u have to be a bit more specific in telling us what exactly u need help with

[clever moon]

I don’t know what it means but I know which one it is. I do not understand the task description. What I need help with is finding the answer

[oak mirage]

do you know the ~7 steps for hypothesis testing?

[tiny stone]

i guess we have to step back and first explain the task itself

[clever moon]

I don’t know anything.

[tiny stone]

and what's going on

the task is about measurements on skulls

they measured 30 very old skulls and 30 not so old skulls

writing down their size

now, the claim is that the skull sizes from both eras varied in about the same manner

[clever moon]

I don’t get that last part

So they’re different? In the same manner- that’s why I don’t get

[tiny stone]

so as an example, maybe they varied about +-5mm back then. then the claim is that they varied at about +-5mm in that other time period as well

and based on the data shown, ur supposed to verify that claim

so far so good? understandable?

[clever moon]

Yes

Is that all

R u done helping or

[maiden harness]

Our helpers are unpaid and help on their free time, so if they take a little while or even just stop answering all together, please don't take offense to it. Somebody else will eventually get back to you as soon as they're able to. 🙂

[clever moon]

unpaid because they wont let me pay

[maiden harness]

Fair point, but it's to ensure that everybody is helped fairly

[worn dome]

unpaid because most people here make more than you can offer to pay

[maiden harness]

That as well

[clever moon]

if you say so

[oak mirage]

now to see if the claim holds we need to check if our test statistic falls within the rejection region based on F with a significance level of 0.05

[tiny stone]

if u absolutely need to get helped asap and want to pay for that, maybe look at fiverr or upwork

[clever moon]

Thanks will do

[oak mirage]

do you know the formula for F

[clever moon]

I don’t know a damn thing and to be quite honest I don’t care I just want someone to do this shit for me and take my goddamn money

[past junco]

Have you tried ChatGPT?

[clever moon]

Thanks for your time tho

Yes chatGPT is incapable of doing these problems

[oak mirage]

lol

[past junco]

$1000

Jk, sorry

[clever moon]

Lol

[past junco]

Try gpt4

[oak mirage]

well i will help but doesnt seem like you want it

just answers

[clever moon]

Hmm I haven’t heard of that one

I’ll try it

Thanks wazei

[past junco]

It's the latest version, meant to be better

But you need to look around on how to access it since I haven't tried to yet, just know of it

Post back if you get answers from it or if it's not available

[clever moon]

Alrighty, will do

lol it was wrong

wazei am i allowed to dm u

idk what this is tellng me to do

[oak mirage]

well

your data has two s values

[clever moon]

ohhh right

ok so

5.17 and 5.38

i dont get the 2 over 1 and 2 over 2 tho

is rhat on a specific kind of calculator?

[oak mirage]

what does it mean when you have a number^2

the subscript is just to differentiate them

since its not the same number that the top and bottom

[clever moon]

i dont know what it means

[oak mirage]

it means (variance 1/variance 2)

you have

deviation 1 and deviation 2

[clever moon]

ohh

what calculator is used for this? since statcrunch has like a lot of different ones

[oak mirage]

well, a calculator that can square and divide

[clever moon]

oh so a normal one?

[oak mirage]

variance = deviation^2

do you understand now?

[clever moon]

nope

[oak mirage]

to calculate F you need variance 1/variance 2

you have deviation 1 and deviation 2

and variance = deviation^2

[clever moon]

that doesnt tell me what to input where

thanks for your time anyways

[oak mirage]

do you know what squared means?

to square a number?

[clever moon]

to put the little two on it

[oak mirage]

yes

[clever moon]

which one do i put the little two on

[oak mirage]

both

you need to square both your values

[clever moon]

so 5.17^2 and 5.38^2?

[oak mirage]

and divide them

yes

bigger on top smaller on bottom

[clever moon]

OHH

ok hold on i thik i get it now

[oak mirage]

that is the formula for F

[clever moon]

26.7289

28.9444

[oak mirage]

yes

[clever moon]

1.08288781057

then what

[oak mirage]

well that is the answer

[clever moon]

whatttttt

ok ok let me try it

OH YOU GENIUS

[oak mirage]

nice

[clever moon]

now how do i find P?

[oak mirage]

well

[clever moon]

since this one is different should i start a new thread for it and delete this one?

[oak mirage]

the P value is the probably that your null hypothesis is true

you need to find the cumulative probability P(F<=1.08) * 2

[clever moon]

Ohh and that’s on a special calculator?

[oak mirage]

u can

u need degree of freedom 1 and degrees of freedom 2

degrees of freedom 1 = n1 - 1
degrees of freedom 2 = n2-2

[clever moon]

do youu have any idea which of these woudl do that

this one?

this one has n

[oak mirage]

you need to use F distribution

the one that says F

[clever moon]

ohhh

[oak mirage]

your degrees of freedom is wrong

your n1 and n2 = 30

[clever moon]

oops

5.17 and 5.38) or (26.7289 and 28.9444

[oak mirage]

no when i say n1 and n2 I'm referring to your sample sizes

[clever moon]

ohhh ok ok

[oak mirage]

ok but its 29 for both because DF = n - 1

[clever moon]

oh right

now how do i know what goes in to px

[oak mirage]

that is your F staticis

statistic

which you calculated

[clever moon]

is that the final answer?

);

there's two more tries for it

do you know what i did wrong?

[oak mirage]

since your test is two tailed you need Pvalue*2, but i was wrong initially your P value is P(F>=1.08) so you need 1-0.58...

[clever moon]

ohhhh ok

ill try that

[oak mirage]

no

its still 10.8

1.08*

but you need to double the answer

[clever moon]

OH

[oak mirage]

you should get 0.837244

[clever moon]

ohhh

wait how dd you get that agian

i did 0.5841595*2

and got this one

yours was right tho

[oak mirage]

1- that

doubled

did it work?

[clever moon]

yep! your answer was right

now im taking notes on this so i remmebr later

[oak mirage]

P-value = P(F>=1.08) * 2 {x2 for two tailed test}
= [1 - P(F<1.08)] * 2

this should make it more clear

so in this case the P-value was bigger than your significance level

so you would not reject your null hypothesis

aka there is not enough evidence to suggest a difference in the variance of the two samples

[clever moon]

so it would be A?

[oak mirage]

read carefully

yes we are not rejecting H0 but for which reason

[clever moon]

i went for C and it was right!(:

thank you

[oak mirage]

np

[clever moon]

26-1= 25

1-9.40444444444= -8.40444444444

*2

=-16.8088888889

oh its 0 lol

somehow

[oak mirage]

you need probability not the test statistic

[clever moon]

so for this one, would it still be -1 on both 35 and 36?

since they aren't the same i'm not sure

1.1886219726

px=<1.1886219726=0.69332709

num df 34 den df 35

[oak mirage]

p-value = P(F>=1.18) * 2 so you want 1-P(F<1.18) * 2

[oak mirage]

yes DF1 = 34, DF2 = 35

[clever moon]

i dont think i understand what part i need to divide at

[oak mirage]

you had to divide to find F

[clever moon]

or subtract

[oak mirage]

since F = s1^2/s2^2

oh

[clever moon]

ok i did that part

to get f

now im trying to find p

do i first divind 1.1886219726 by 2?

or do i divide it after

[oak mirage]

no

[oak mirage]

.

[clever moon]

letters confuse me

[oak mirage]

which letters

[clever moon]

idk which number goes where aymore

if youre not telling me to multiply thenwhat is the *2

[oak mirage]

when did i say not multiply?

[clever moon]

1.1886219726*2=2.3772439452

[oak mirage]

again, you multiply the resulting probability by 2 not the test statistic

[clever moon]

so multiply at the ened?

[oak mirage]

yes

and you keep calculating P(F<=1.18) with your program

you dont want that

[clever moon]

0.69332709*2=1.38665418

[oak mirage]

you want P(F>1.18)

[clever moon]

oh the other way

ok

[oak mirage]

how do you go from P(F<=1.18) to P(F>1.18)?

[clever moon]

0.30667291*2=0.61334582

that was right!!

thanks again

[oak mirage]

do you understand anything that you are doing?

do you need explanation?

[clever moon]

I think i understand it now. it was just confusing for a while because I forget which letter is what number

this one is pretty different but it's also about finding the test statistic

i opened it in statcrunch and it looks like this

is this something you understand?

wait wait i see the same symbols from last time

ok so both standard devs times 2 divided with bigger on top

[oak mirage]

incorrect

[clever moon]

oh

[oak mirage]

and it was squared not times (big difference)

you arent testing for variance

you are testing means

[clever moon]

oh right i forgot the term but i was thinking squared

[clever moon]

ohhh

and how am i supposed to do that?

would i the same thing, squaring them and then dividing?

x overbar instead of s

[oak mirage]

no

dont you have any textbook, notes, lecture slides?

you need to calculate a pooled variance first

because population variance is unknown

[clever moon]

i think i saw that somewhere

it sounds familiar

im going to look

So i watched some videos on it and they always appear to just have it as pooled already, and i dont know how they do that

there's no videos on how to do it in statcrunch either

the one i did find, actually has the numbers of each individual number in the stat, which i do not have for this probnlem

i decided to move on to this one

this one seems a little simpler

does anyone here understand it enough to explain?

[oak mirage]

well, the whole point of linear regression is to find some linear function which you can use to map some set of values to another, in this case an equation was found where you can find the mi/gal of a car using the weight of the car based on sample data

this would depend on what you were taught to do some people use t test some use z test, the question says do not assume standard deviations of the population are equal to you cannot use a pooled variance, then depending on what you were taught to do you have to calculate a difference of means test statistic

[oak mirage]

so they found a function y_hat = 58.9-0.00749x which has weight as input and mi/gal as output, so if you want to find the fuel consumption of a car of 3003lb what would you do?

[clever moon]

input those numbers somewhere in the calculator or data

[oak mirage]

you could say that for the entire problem set of statistics

[oak mirage]

what is x in this equation?

you answered it in c

[clever moon]

3003

[oak mirage]

x is weight

so the input of the function is weight

now you want to predict the mi/gal using that weight

so you use the function

and input 3003

[clever moon]

58.9-0.007=3003?

t calculator?

[oak mirage]

what is the input of the function? the x or the y

the function can be rewritten f(x) = 58.9-0.00749x

look familiar?

its just a line

on an xy plane

you have an input (x) and you want the output (y)

[oak mirage]

here you are assigning the output

[sick axle]

[clever moon]

chatGPT is a flop when it comes to stats word problems

it worked earlier in the semester for some sections but not these last ones

[oak mirage]

well now i know why you are so lost

[clever moon]

ohhh so am i supposed to put it on a graph/

[oak mirage]

if you want to look at it.

have you done functions in math

lines?

y=mx+c?

[clever moon]

no i havent

[oak mirage]

impossible

[tiny stone]

why are u song advanced math if u never did the basics?

[oak mirage]

this is first year second semester statistics and lines are highschool math

[tiny stone]

ur looking at uni level math, missing stuff u would usually learn in grade 8

[clever moon]

im forced to take this class

its GE

[oak mirage]

a prerequesite for the class would have been some sort of math

[oak mirage]

GE?

[clever moon]

general education

[oak mirage]

what math have you done? like overall

[clever moon]

well i did algebra 2

i dont remember anything from it tho

got a D

my major isnt math related lol dont come for me

[tiny stone]

it's just kinda odd

and u will struggle with the next assignment in the same way

and with the one after as well

[clever moon]

well i usually paid people do it for me

[tiny stone]

but that doesn't solve the problem on a long run

[clever moon]

i wont use this in the long run

thats the thing

[oak mirage]

how will you pass the exam?

[clever moon]

i have an A so i dont need to take the last one since lowest one will b dropped

on the verge of a b tho

so im finishing up these assgnments

[tiny stone]

as a general note, be careful with openly talking about cheating on a big public server. wouldn't be the first time the teacher was listening here as well

[clever moon]

well you dont know me or where im from lol

thankfully

theres hundreds of students using the same program

thousands maybe

[tiny stone]

the teacher will recognize their assignment though and might figure out. I'm just saying, it has happened a couple of times here already

oke

[clever moon]

man youre making me paranoid now lol

[oak mirage]

good

[clever moon]

shit ill go pay someone finish this up for me

thanks to all of you who tookt eh time to help

[tiny stone]

well, i dont really like ur way, but i wish u the best. good luck

[oak mirage]

i felt like i just wasted my time now, since you didnt want to learn anyways

but yeah

good luck

[clever moon]

I did learn tho

like i said

i appreciate it