Edexcel S1 - 15th June, 2016 [Exam Discussion]

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You need to read the question. The top 25% of the candidates get a merit.

The top 75% of the candidates get a pass. This 75% includes the 25% getting a merit.

So the middle 50% between 25% and 75% are candidates who pass but don't get a merit.

It has nothing to do with "even if they got 74% they'd pass", the question says absolutely nothing about the marks of the candidates (so how on earth can you say if they got 74% they'd pass??? You don't know that...), simply their ranks. The top 75% get a pass, the top 25% get a pass and a merit. So the 75% - 25% = 50% middle get a pass but not a merit.

Original post by beast709

The people from 25% till the end of the whole box plot are passing. So, from the Q1 to the Q3 is the amount of people passing and from Q3 till the end is the amount of people getting merit. The number of people ONLY passing, is therefore the amount from Q1 to Q3, which is (75-25) = 50%.

Very true.

Thank you guys!

Reply 561

SweetChilliCake

What is the hardest S1 paper out there? Or hardest questions?

Reply 562

Zacken

Original post by Pink1998

Hi, for last year's June 2015 paper. In the last question they've written P(X>w / X>28)
Is that "/" a divide sign or a "given that" sign?
Thank you

Probably a given that.

Reply 563

SANTR

Original post by Zacken

Probably a given that.

Hi,

I would appreciate it if you clarify this. Suppose you have a probability of exactly 0.8000 but the only values on the table are 0.7995 and 0.8023 with 0.84 and 0.85 as the corresponding Z values respectively; how would you determine what the Z value is?

Thanks

Reply 564

safhassan

Original post by SweetChilliCake

What is the hardest S1 paper out there? Or hardest questions?

Try the Gold S1 papers which combine the hardest questions in the spec

Reply 565

Zacken

Original post by SANTR

The table below the normal distribution table, i.e: the percentage points table gives you the z value to 4 d.p.

Reply 566

tazza ma razza

Original post by danthebox

ur a ****

cheers

Reply 567

NigelK98

Hey when do we use class boundaries when doing linear interpolation do we use it for histograms and the table or only the table?

Reply 568

SweetChilliCake

Original post by safhassan

Try the Gold S1 papers which combine the hardest questions in the spec

Thank you. I'm doing 2015 IAL

Reply 569

jackf9283

if you have boundaries of 0-4 is the class width of that data 4.5 or 5 as the upper bound would be 4.5 assuming the next boundary if 5-something. But would you use -0.5 or just 0

Reply 570

AlphaWolfZ

Original post by AlphaWolfZ

OK guys,

I've been losing marks on those type of questions that revolve around normal distribution and conditional probability. Here are 2 examples of a similar method for answering. What shall I do when answering these questions?

JUN 13 Q4c)

Spoiler

JAN 13 Q5c)

Spoiler

Anyone?

Reply 571

Zacken

Original post by iMacJack

Very true.

Thank you guys!

No problem.

Reply 572

Guèpard

ExamSolutions is playing up!

Seriously, now had to be the time :colonhash:

Reply 573

Jack_Linaker

Original post by AlphaWolfZ

Spoiler

JAN 13 Q5c)

Spoiler

Attachment not found

IMG_0414[1].jpg513.1KB

IMG_0415[1].jpg506.2KB

Reply 574

Philip-flop

Do we need to know how to use this version of the Standard Deviation...
http://4.bp.blogspot.com/-ClgskLBxLjQ/Ut-smPagORI/AAAAAAAAA4k/q_u7caTUj-0/s1600/stdev_s.gif

Reply 575

Dohaeris

Are you guys ready? It'll all be over soon :smile:

Reply 576

AlphaWolfZ

Original post by Jack_Linaker

Attachment not found

Mega Thanks buddy. Why do you divide one over the other? Is that the rule?

Reply 577

SweetChilliCake

I dont understand what values you sub in to get d in part c?

Reply 578

Uberphuq

Original post by asinghj

If you hav DISCRETE data then the median is at the (n+1)/2 th position.
If you have continuous data then the median is at n/2 th position
So add 1 for Q1, Q2, Q3 if you have dicrete data