S1 Jan 2012 Edexcel Post Exam Discussion Thread - Solutions in the first post

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Hoping for low boundaries for S1 this year and I have a good reason why.

Question 2 ...WTF was that? Seriously? Question 2a) was do-able, I knew it was mutually exclusive. But the rest...

I used to absolutely love venn diagrams , but not anymore .

I mean I attempted 2b), and I intially got a negative value for A intersection B. I mean that logically doesn't make sense. How can the intersection be a negative value when it is mutually exclusive when the intersection is 0??? And because I got P(B) wrong (my answer to that was 5/12), I got the rest wrong .

Normal distribution, I was really good on and would have at least scored full marks on that.

Being someone who has done through revision for this module, I think it is fair to say that the boundaries should be slightly lower.

Im just happy with an A.

People on this thread, can you please tell me on what you thought about question 2. Just a bit interested to know. Thats all

Im certainly p***ed off about it and so are my mates (proper nerds)

Hoping for low boundaries for S1 this year and I have a good reason why.

Question 2 ...WTF was that? Seriously? Question 2a) was do-able, I knew it was mutually exclusive. But the rest...

I used to absolutely love venn diagrams , but not anymore .

I mean I attempted 2b), and I intially got a negative value for A intersection B. I mean that logically doesn't make sense. How can the intersection be a negative value when it is mutually exclusive when the intersection is 0??? And because I got P(B) wrong (my answer to that was 5/12), I got the rest wrong .

Normal distribution, I was really good on and would have at least scored full marks on that.

Being someone who has done through revision for this module, I think it is fair to say that the boundaries should be slightly lower.

Im just happy with an A.

People on this thread, can you please tell me on what you thought about question 2. Just a bit interested to know. Thats all

Im certainly p***ed off about it and so are my mates (proper nerds)

Ugh, I flopped this test so hard. Hopefully I can scrape a B I don't honestly remember what I wrote now...

grade boundaries depend on how well candidates have done, obviously the difficulty of the paper will impact this massively.

it we compare the paper to Jan 09 which was 65 for 80ums

Q1) Linear regression, slightly easier than 12
Q2) Venn diagram, fairly tricky but easier than 12
Q3) DRV, much harder than 12, e) was very poorly answered
Q4) Box plots, not asked in 12 but fairly easy; Correlation, fairly easy
Q5) Histograms and averages; I would say this was much harder than 12, interpolation is normally a bloodbath
Q6) Normal distribution, marginally more difficult.

So, overall I would say this was an easier paper. It could be less than 65 for an A (it could be more) but I really don't think it will be very much less.

whilst the student room is definitely not representative of the national picture, look at the poll.

hi arsey for PMCC i said would decrease would i get any marks and for the scaled Sd I GOt 4.5 and for regression i got a= 16.something and for the probability quetion i got 5/12 for P(B) and the last question on normal distribution i got 230.975 and for the last part got 0.04? so how many marks would i lose in total and for the histogram got like 68.5 and for the scaled SD i got 4.5 so how many marks would i lose in total? will i get method marks? thanks

LOL how do you still remember

I got all of question 2 (bar mutually exclusive) wrong. 8 marks gone! :'(

I'm not even sure that I remembered mutually exclusive correctly - so that is 9 gone, as I got the rest totally wrong!!!

hi arsey for PMCC i said would decrease would i get any marks and for the scaled Sd I GOt 4.5 and for regression i got a= 16.something and for the probability quetion i got 5/12 for P(B) and the last question on normal distribution i got 230.975 and for the last part got 0.04? so how many marks would i lose in total and for the histogram got like 68.5 and for the scaled SD i got 4.5 so how many marks would i lose in total? will i get method marks? thanks

I'll have another look at the mark scheme when i get it back. I've just leant it to a friend. So this pm I could have a look for you.

But basically you lose A marks for accuracy, and M marks for method. so you could probably go through it better yourself. Just lose 1 mark everytime you make a mistake.

for PMCC i said would decrease would i get any marks - yes 1
and for the scaled Sd I GOt 4.5 - which Q is this?
and for regression i got a= 16.something - which Q is this?
for the probability quetion i got 5/12 for P(B) - You lose at least one mark, maybe more if your method was wrong!
the last question on normal distribution i got 230.975 - no points for accuracy, but I don't know your method!
for the last part got 0.04? - again no points for accuracy but you may or may not get method marks
for the histogram got like 68.5 - I think you lose 2 accuracy marks (1 for part a and 1 for part b)
and for the scaled SD i got 4.5 so how many marks would i lose in total? will i get method marks? thanks


I hope that helps.

for PMCC i said would decrease would i get any marks - yes 1
and for the scaled Sd I GOt 4.5 - which Q is this?
and for regression i got a= 16.something - which Q is this?
for the probability quetion i got 5/12 for P(B) - You lose at least one mark, maybe more if your method was wrong!
the last question on normal distribution i got 230.975 - no points for accuracy, but I don't know your method!
for the last part got 0.04? - again no points for accuracy but you may or may not get method marks
for the histogram got like 68.5 - I think you lose 2 accuracy marks (1 for part a and 1 for part b)
and for the scaled SD i got 4.5 so how many marks would i lose in total? will i get method marks? thanks


I hope that helps.

hi arsey for PMCC i said would decrease would i get any marks and for the scaled Sd I GOt 4.5 and for regression i got a= 16.something and for the probability quetion i got 5/12 for P(B) and the last question on normal distribution i got 230.975 and for the last part got 0.04? so how many marks would i lose in total and for the histogram got like 68.5 and for the scaled SD i got 4.5 so how many marks would i lose in total? will i get method marks? thanks