Edexcel A-level Statistics Paper 3 - 17th June 2025 [Exam Chat]

do we think grade boundaries will increase or decrease this year 😭😭 i actually can’t tell

france ireland question you had to do paired t test pretty sure , cause it was a test for difference and them saying it wasn’t symmetrically distributed meant wilcoxon wasn’t valid . also the confidence interval u had to calculate sample variance and use t distribution

Beware the wording you use here. Did it say the distribution of the DIFFERENCES isn't symmetrical? that would discard a wilcoxon but if it just said not symmetrical this does not. Also remember a paired t test requires a the distribution of differences to be normal

yeah tbf cant remember off the top of my head - you could be right . i initially did a mann whitney and then i scribbled it out and did paired t test because it they mentioned the word difference, what other tests apart from wilcoxon and paired t take into account differences? sign doesnt and nor mann whitney. idk its over now ill assume i got it wrong lmao

yeah tbf cant remember off the top of my head - you could be right . i initially did a mann whitney and then i scribbled it out and did paired t test because it they mentioned the word difference, what other tests apart from wilcoxon and paired t take into account differences? sign doesnt and nor mann whitney. idk its over now ill assume i got it wrong lmao

I did spearman rank for that question, we can’t use Wilcoxon tests because they require a symmetrical distribution nor Pearson product as they require normal bivariate data which isn’t the case

Didn't even think of spearman's rank but I would've thought that would show if the two are correlated rather there is a difference the average number of people

I did wilcoxon signed rank

I didnt sit the paper this year so was just curious, didnt want to make you doubt yourself! I sat last year and got an A*, i like to hover around and see what came up this year

i really wanted an A* too, do you know what marks you averaged over each paper because i just dont think ive got enough. maybe 65 ish on paper 1 and 2 and maybe 70 / 80 for paper 3

i got 75, 74,76

thats crazy man well done , so its not looking like an A* for me then lmao

For question 3C comparing mean times for London or Berlin marathons did anyone get 0.828?

Did anyone do a sign test on Q2 with France and Ireland and accepted H0?

Anyone get 17.35 ish for the CHI Squared, question 3B