Edexcel A-level Statistics Paper 2 - 10th June 2025 [Exam Chat]

Reply 40

dontcare2

10

Original post

by DylanPiii

Whether a blocking factor was effective or not, yeah

beautiful question, love those ones

Reply 41

Luqmlam

11

I think I'm in the minority after speaking to my class but I enjoyed that paper.

5c was horrid and I did a sign Test which is the correct test but I got the wrong p in the binomial.

Everything else was decent, took me a while to figure out 1 sample z but good in the end. Love anova, good continuous uniform G.O.F.

Wilcoxon ranks sum was decent too.

The benefits of having those giant calculators to check the CV and p-value :smile:

Reply 42

dontcare2

10

A GOF came up? havent seen that in years. Uniform is a fishy one with GOF as people forget it exists

Reply 43

Luqmlam

11

Original post

by dontcare2

A GOF came up? havent seen that in years. Uniform is a fishy one with GOF as people forget it exists

Yes it did. My teacher said it was guaranteed to after not coming up for 2 years.

No confidence intervals yet again! My teacher said its 100% going to come up in paper 3 since they weren't there last year.

Continuous uniform was good it give you like the entire table and because it was all equally likely each probably was 0.125

Reply 44

Luqmlam

11

Original post

by dontcare2

A GOF came up? havent seen that in years. Uniform is a fishy one with GOF as people forget it exists

There was a 1-sample proportion using critical region only that came up. Absolute bliss because I'd revised it considering my teacher said it has a strong possibility of coming up.

Reply 45

annanshsbwbwjj

1

Original post

by Luqmlam

There was a 1-sample proportion using critical region only that came up. Absolute bliss because I'd revised it considering my teacher said it has a strong possibility of coming up.

what did you get for this? high key panicked cuz i only ever use p values

Reply 46

DylanPiii

8

Original post

by Luqmlam

I think I'm in the minority after speaking to my class but I enjoyed that paper.
5c was horrid and I did a sign Test which is the correct test but I got the wrong p in the binomial.
Everything else was decent, took me a while to figure out 1 sample z but good in the end. Love anova, good continuous uniform G.O.F.
Wilcoxon ranks sum was decent too.
The benefits of having those giant calculators to check the CV and p-value :smile:

What was the correct way to do a sign test for 5 part c? I'm really curious now cause I've never seen a question like that before

Reply 47

Luqmlam

11

Original post

by annanshsbwbwjj

what did you get for this? high key panicked cuz i only ever use p values

58 and below I think.

57 was T.S and inside cr

So result significant

Not 100% if I've remembered exactly but something like that.

Reply 48

Luqmlam

11

Original post

by DylanPiii

What was the correct way to do a sign test for 5 part c? I'm really curious now cause I've never seen a question like that before

Apparently using π = 0.5 for H0

Not too sure about H1.

Never would of got that though tbh.

Reply 49

kanyecasino

12

Predictions for paper 3 lads? Should be fairly easy to predict...

Reply 50

graphic-beer

1

Original post

by alllllliice

How did it go for everyone?

Did anyone else do wilcoxon for the non parametric test?

Reply 51

graphic-beer

1

Original post

by ocollier

Did anyone get 2. something in the T test for male and female time taken to pack suitcase?

I rejected HO

Reply 52

Luqmlam

11

Original post

by ocollier

Did anyone get 2. something in the T test for male and female time taken to pack suitcase?

Yes 2.1 something I think. I did the lower tail so -2.1

Reply 53

dontcare2

10

Original post

by Luqmlam

There was a 1-sample proportion using critical region only that came up. Absolute bliss because I'd revised it considering my teacher said it has a strong possibility of coming up.

yeah they explicitly stated thats a posibiity of coming up after last years paper 2 final question which was considered off spec since no where did they tell us we had to know it.

Reply 54

Lastboss

1

Original post

by Luqmlam

Apparently using π = 0.5 for H0
Not too sure about H1.
Never would of got that though tbh.

Im fairly certain it was a paired sign test using n =8 since its the number of non zero differences. So the t.s. Should have been 0 (since they agreed 0 times in the 8 non zero outcomes out of 30). Only thing that makes sense in my opinion, although I could be wrong
So Ho as nd = 0 and H1 as nd≠0

Reply 55

Luqmlam

11

Original post

by dontcare2

yeah they explicitly stated thats a posibiity of coming up after last years paper 2 final question which was considered off spec since no where did they tell us we had to know it.

My teacher just said, it usually comes up once every 5/6 years and last came up 2019 or something. What was last year paper 2 question?

A paper 1 question from our last paper apparently had ‘curve of variation’ in the mark scheme which wasn’t even on the spec.

Reply 56

dontcare2

10

Original post

by Luqmlam

My teacher just said, it usually comes up once every 5/6 years and last came up 2019 or something. What was last year paper 2 question?
A paper 1 question from our last paper apparently had ‘curve of variation’ in the mark scheme which wasn’t even on the spec.

if i remember correctly, it was type 2 error of a 2 sample z test or something. Everyone complained and no one in the country practically could answer it ( i had learnt it for fun) and so in the examiner report they explicitly listed the tests in which it can be asked for and surprise surprise, one came up this year

Reply 57

DylanPiii

8

Original post

by Lastboss

Im fairly certain it was a paired sign test using n =8 since its the number of non zero differences. So the t.s. Should have been 0 (since they agreed 0 times in the 8 non zero outcomes out of 30). Only thing that makes sense in my opinion, although I could be wrong
So Ho as nd = 0 and H1 as nd≠0

I feel like that wouldn't work either though, since him failing 8 out of *30* is the important bit - surely using a sign test and discarding the 22 correct quality assurances would not be correct? this question drove me absolutely mad cause nothing I thought of worked 😅

Reply 58

Lastboss

1

Original post

by DylanPiii

I feel like that wouldn't work either though, since him failing 8 out of *30* is the important bit - surely using a sign test and discarding the 22 correct quality assurances would not be correct? this question drove me absolutely mad cause nothing I thought of worked 😅

So I did it with n=30 at first but the conclusion I got to made no sense. It ended up being that the less they disagreed on the smaller the p value was for n= 30, however if you decrease n then the number they agreed on gets smaller to 0 and the p value then got smaller. I’m not 100% sure tbh but with n as 30 the conclusion just didn’t make any sense

(edited 11 months ago)

Reply 59

ocollier

5

Original post

by Lastboss

So I did it with n=30 at first but the conclusion I got to made no sense. It ended up being that the less they disagreed on the smaller the p value was for n= 30, however if you decrease n then the number they agreed on gets smaller to 0 and the p value then got smaller. I’m not 100% sure tbh but with n as 30 the conclusion just didn’t make any sense

I Used the p^-p formula, bottom corner of the formulabooklet on a page. Ho: pi=0.5, H1: pi>0.5. p^ = 22/30and p= 0.5. Could be wrong though

Edexcel A-level Statistics Paper 2 - 10th June 2025 [Exam Chat]

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