AQA Further maths additional modules 7th June

[lapis oriole]

Did you ?

[rocky gate]

Sounds fine I think

[celest flame]

k>0.2 or k<-0.2

[rocky gate]

2 was somewhere

[rare bluff]

Ye

[rocky gate]

What did you guys get as Var(Y)

[celest flame]

i was surpsied

[lapis oriole]

3n + 10

[celest flame]

3/4 n^-1 -1

[celest flame]

??

[rocky gate]

3n+10?

[lapis oriole]

You have to transform it

Y = 3X + 10

[celest flame]

yes so 3^2 * (n^2 -1 / 12)

[rocky gate]

Var(x) = 1/12 (n^2 -1 ) or something

[rare bluff]

I don’t think k<-0.2 is right because k can’t be negative

[celest flame]

ye

[lapis oriole]

Yup

[rocky gate]

Then multiply that by 9

[celest flame]

it never said that tho

[lapis oriole]

Ye

[celest flame]

i read it like 3 times

[rocky gate]

You don't add 10

[rare bluff]

Ye I got that

[rocky gate]

You just multiply by 9

[lapis oriole]

Yeah that's right

[celest flame]

someone find a student room thing

[lapis oriole]

There is one

[celest flame]

send

[lapis oriole]

There was no "terrible" or

[rocky gate]

Not many posts on it

[lapis oriole]

The second worst

Only

"Goods" and the best one

Well it isn't specific to mechanics

[celest flame]

whats the titel

[lapis oriole]

It's just paper 3

[rocky gate]

7367 / 3

Or something like that

[lapis oriole]

I'll send link

https://www.thestudentroom.co.uk/showthread.php?t=7459093

[rocky gate]

People got 0.4 for the power of the test there

And 0.13

[lapis oriole]

I'm thinking for boundries

80 70 41 41

[rocky gate]

70 is too low for Paper 2

[celest flame]

thatd be very nice

hows everyone getting 0.40 for power ???

[rocky gate]

I'm still lost on how you guys got 0.13

[celest flame]

88/100 😭

[rocky gate]

Someone didn't do well on their paper 3

[celest flame]

haha

[lapis oriole]

I feel people made mistakes

[celest flame]

why tf are they using 10.06 and 10.34 for the bounds???

[lapis oriole]

Idk bro

[rocky gate]

I have no clue at this point

[celest flame]

so many people did it tho

[rocky gate]

That's why I stopped looking at the page

[lapis oriole]

Just leave it it's fine 😭😭

[celest flame]

yhyh

[rocky gate]

Yeah

You might be right, paper 2 seemed to have some questions that people didn't do, due to time pressure

[celest flame]

paper 2 wil be in 70s for a*

1 probably 80s+

[rocky gate]

Has a paper ever gotten to the 80's in previous years?

[celest flame]

2023 i think

[rocky gate]

I have no doubt I lost more* than 7 marks on paper 1

But still

That's bloody high

[celest flame]

ithink highest is 75 in 2023

not sure tho

[celest flame]

only other real year to compare is 2019 which was 69 being the highest

2020 and 2021 and 2022 dont count

[rocky gate]

This year felt easier than 2023

[celest flame]

yh

maybe like 230 then

thats still really low i wouldve thought

[rocky gate]

Probably worst case

[rocky gate]

235

[celest flame]

70 marks lost and still a*

[lapis oriole]

That was relatively easy

Part 1

[celest flame]

for these papers 70 marks lost is quite a lot

[lapis oriole]

Yeah

[celest flame]

given how easy paper 1 and 3s were

[lapis oriole]

Maybe

[rocky gate]

Agreed

[lapis oriole]

80 75 41 41

[celest flame]

237

[lapis oriole]

That's pretty reasonable

[celest flame]

overall 79%

yh maybe actually

[lapis oriole]

Something like that

[rocky gate]

Not terrible

But at the same time

(2019)

[celest flame]

thats regualr no?

it was like 200 in 2019

[slender quarry]

What are the 2024 gb looking like

[celest flame]

230s

[slender quarry]

Wow

[lapis oriole]

This is 2019?

[celest flame]

no thats regular maths

[lapis oriole]

Oh was gonna sah

[celest flame]

this is 2023, above i sent 2019

[lapis oriole]

Say

[celest flame]

216 2023 seems low for those years

id say about 225 - 235 is for a*

for 2024

[lapis oriole]

Yh and their second paper was relatively hard and they got somewhat railed for mechanics

And still 216

[celest flame]

mechanics werent even bad in 2023

[lapis oriole]

So 230 is 100% reasonable

[celest flame]

i think i got like 90+ paper 1 idk about paper 2 and like 95%+ paper 3

[lapis oriole]

Damn

How do you think you did this year ?

[celest flame]

that above

that was for this year

[lapis oriole]

Fair enough

[celest flame]

i got like 90% mech stats in 2023 and like 81 in paper 1

2023

i cant remember paper 2

[lapis oriole]

That was not a straightforward paper like 2024

But it was decent

[celest flame]

i thought paper 2 this year was more diffiuclt

[lapis oriole]

Still the boundries for that individual paper was 71

[celest flame]

idk how i did

20 questions pisstake

[lapis oriole]

Oh really ?

[celest flame]

i know i lost atleast like 10

i dont know about rest tho

[lapis oriole]

Me personally I think that was my best

Out of the 2

[celest flame]

how did u do the complex q where u had to show theta = arcsin

for the arguement

i did some massively long method

[lapis oriole]

I'll need to see it

But I did it relatively quickly

It was only 3 marks tbf

[celest flame]

yhh

i didnt do reduction formula

and another q

i get a few mmethod marks tho

[lapis oriole]

Did your matrices one come out fine ?

Inverse matrix

[celest flame]

i cant remember the q

[rocky gate]

It's for Normal math

I was just saying having grade boundaries similar is kind of mad

[celest flame]

maybe they just keep grade boundaries similar to last year and just let few more % get A*

[rocky gate]

What percent of students actually get A* though

Pre-covid?

[celest flame]

2019 and 2023 are only ones we can compare too

2022 was elevated

25.3% got A* in 2023
17.6% in 2019

[rocky gate]

What was 2019

[celest flame]

damn

wtf

massivev difference

2022 was 38% lol

that was on purpose inflated

i think they allow it to change my like a decent bit on its own if the cohert is just better on average

liek in 2019 to 2023

[lapis oriole]

It's based off how people do tho no?

[rocky gate]

I can guarantee you one thing

Two people from my class will single handily drop the boundaries by one mark.

[lapis oriole]

😭😭😭

That is another problem tho

Apart from your class maybe

[slender quarry]

Well I was talking to the y13s from our school and they found paper 1 very good but messed up timing for paper 2

[lapis oriole]

But people who do fm ain't messing around

[celest flame]

most people yh

[lapis oriole]

Yeah something like that

[rare bluff]

@celest flame what uni you going to?

[celest flame]

oxford

wbu

[slender quarry]

Do you know anyone who sat step

[rare bluff]

Loughborough

[wooden gull]

mechanics was nice yeah as u said it was similar to the practice set

the toppling question almost identical hahaha

i think i got around 48-50/50 idk

[celest flame]

What u get for k?

[rare bluff]

@slender quarry Btw that question you sent part c came up

that toppling question

[wooden gull]

0.2 iirc

but could be 0.6 or something i cant remember if i did it from the wrong end

[rare bluff]

yeye i think i got 0.2

[celest flame]

Did you not need to include negative k values also?

Also what u put for the inequality final q

I put U^2 <

[wooden gull]

okay great

[wooden gull]

well i couldn’t think it thru properly cos theres 2 arguments depending on how u interpret the q

i put U> for work done by resistances

but then there the argument v down so then centripetal down so then U but

the q was ambiguous as to whether reaching same height or what

so i didnt know which argument they wanted

[rare bluff]

ye i agree

[wooden gull]

yeah thats why i think 48-50 cos idk how they’re gonna judge it at all

was odd

[rare bluff]

k cant be negative tho?

oh wait

[wooden gull]

i think the case where k is negative is trivial and the same case so probably will be ignored

[rare bluff]

ye

[wooden gull]

since its the exact same cone but just flipped

[rare bluff]

also @celest flame going back to the power question😂 even if they did give you h0 you wouldnt use that to create a confidence interval since h0 refers to the population mean where as confidence intervals are calulated with sample mean

idk tho

[wooden gull]

and u cant penalise everyone ignoring it when it changes the situation not at all

[rare bluff]

ye

regardless its like 1 or 2 marks max for missing it

[wooden gull]

yeah i think they wont tho

probably be condone negative a wekllk

[celest flame]

Yh I know the k thing is just the sing flipped same exact scenario but idk

[celest flame]

I think I'm correct

[celest flame]

That makes sense ig, I put air resistance and whatever and said it won't reach that height cuz some energy against air resistance so U^2 must be less than the ideal scenario

We probably had the easiest mechanics paper tho

And also paper 1

[rare bluff]

ye

hopefully the boundaries aren't to high

[celest flame]

They will be highest ever been probably

[rare bluff]

yup

[slender quarry]

Wait really

Well thats good then

Glad I was able to help

[rare bluff]

ye i dont think id of done it had you not sent that

[slender quarry]

Well that’s really good to hear

[rare bluff]

and my teachers the goat cos she replied at like 11pm and sent me solution

[slender quarry]

That’s so good

How was stats btw

[rare bluff]

it was good

[slender quarry]

Were they any hypotheses questions?

[rare bluff]

ye

think there were 3

[slender quarry]

I did the as fm

[rare bluff]

hwo was it

[slender quarry]

And we got 1 mark on chi squared

But it was good

Pure was nice

We had to convert a polar ellipse to hyperbolic form

[rare bluff]

yeye good good

we the chi squared thing we had was 8 marks

but it was weird

@celest flame

what did you get in your expected frequency table

cos my solutions where weird

[slender quarry]

Pooling?

[rare bluff]

idk if i did it wrong

ye i think so

[celest flame]

all coloms were the same

like the 3 values in each coloum were same

i think 93 87 and 75

i might be amking that upt ho

[rare bluff]

yeye good

id not seen it like that before

[nova estuary]

Can you actually use your calculator?

I’m doing model solutions rn and I’m on that question bro if I expand this thing I already run out of space 😭

Like apart from using ur calculator is there no quicker way other than expanding ? Even integrating it is messy

[lapis oriole]

I used my calc

[rocky gate]

Substitution is the other way

I started the substitution, looked at it, and said no.

Then just used my calculator

[rare bluff]

swear it was 7 marks

[rare bluff]

same

[rocky gate]

There was X and Y volume of revolution 2 and 3 marks respectively

[rare bluff]

i think they were 3 marks

and 4 marks

[rare bluff]

pretty sure