Arsey's S1 Edexcel Summer 2013 Model Solutions BOTH PAPERS

For 4f) I just wrote reduced (left out by five), how many marks would that be likely to lose (I got whether they reduced or stayed the same right)? For 1c) I also wrote yes, lie close to a straight line, and on the venn diagram I thought the 0s wouldn't be necessary. They're the only mistakes I made according to this mark scheme and thread, I need 84 UMS so fingers crossed.

For 4f) I just wrote reduced (left out by five), how many marks would that be likely to lose (I got whether they reduced or stayed the same right)? For 1c) I also wrote yes, lie close to a straight line, and on the venn diagram I thought the 0s wouldn't be necessary. They're the only mistakes I made according to this mark scheme and thread, I need 84 UMS so fingers crossed.

Ok sorry just understood what you meant. Errrmmm for the 5 bit that you left out.. It's already written in the question about decreasing by 5. I'm sure it won't be that big of a deal for missing out 5 . If you've written that the standard dev stays the same you should definitely get a mark for that which I'm sure you will.

I hope we get the mark for lie close to a straight line. I mean we obviously wrote that because we knew r was -0.95

I don't think it matters if you left out the zero- technically you would have got all the marks providing the values are correct.

If the examiners aren't too harsh you should get away with the "lie close to straight line" if you haven't written about r is close to -1 (or you would only lose one mark max for this)

For 4f if you've written which ones reduce by 5 or stay the same correctly it should get you all three marks. ( sorry didn't understand what you meant for 4f)

Overall you've done pretty amazing! :-)

Is Graham a revered and legendary character in Edexcel A Level threads? I've met him. Can I claim a prize?

Thanks for the response! I hope you're right/ marking my paper.. You never know how picky they'll be, you can get every answer technically right but lose silly marks for missing key words. I concentrated so hard on that damn venn diagram I am just thankful that I worked something sensible out in the end

None.

Venn diagrams can show the actual elements in each section, the number of items, or, (in the context of probability), probabilities.

Which is best depends on context, or any explicit instructions. Here you weren't given any explicit instructions, but the subsets were referred to as "events", putting the question in a probability context. So giving probabilities as you did is certainly appropriate. I would be outraged if you lost a mark.

In fact, I think it is more likely that people who did what Arsey and I did would lose a mark for not picking up on the word "event", but I think that is still very unlikely. Almost certainly either choice will get full marks.
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Aslong as you had the events F , H and C all intersecting ( overlapping ) with the event B , BUT F , H and C didn't overlap each other then your correct

thats what i did anyway - did one big circle for event B , then had the other three circles intersecting the big circle , but the other three did not intersect each other.

It doesn't mean that, it is NOT full time AND walks. Think about what that would look like on a Venn. You have to also include full timers who don't walk and walkers who are not full time.


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Anyone knows or would confirm whether question four was positively or negatively skewed?

MAD Phil firstly great solutions like the Notes, secondly im sorry to say your hand writing is atrocious

Is Graham a revered and legendary character in Edexcel A Level threads? I've met him. Can I claim a prize?

Centres are allowed to use papers for internal use once all of their candidates have sat the paper no idea what your exams officer is on about. In the good old days I could go in just before the exam have a good shufty through the paper.

I am no Edexcel mole. I have used pretty much every centre over the years and without question Edexcel are the most professional and offer the most support. GC is a very nice bloke too. That said, I am more than happy to criticise them when merited. I am not sure what you mean by individualistic either.

There is an option in acrobat pro to reduce file sizes btw.

I think they are looking for the actual % though

Hi Arsey, glad to meet you. Thanks for the info about the use of exam papers; perhaps I'll try to push for a change of policy at our place. As you say, things have tightened up compared to the good old days, but it sounds as if they are a lot tighter here than elsewhere. We had assumed that that was because of rules coming from Edexcel reflecting the use of the exams across time-zones, but if it's just empire-building closer to home, your information will be useful and much appreciated in the fight-back!

By being "individualistic" I guess I just mean "out of line with sensible mathematical practice", or, roughly speaking, "Wrong". This seems to happen mainly in S1, which is why I don't like teaching it. At our college we have quite a collection of what we call "Edexcel shibboleths", i.e. things that students have got to say to get marks from the S1 examiners, even though they are unjustified or just plain wrong.

Some of us hold our noses and try to teach S1 the Edexcel way, pretending to believe in the shibboleths ourselves. Others teach what they believe is logical, sensible and correct, and then explicitly warn the students about the shibboleths, drumming it into them just before the exam that it's worth writing what you know the examiner wants, even though you know it's not true.

Both strategies have advantages and disadvantages. Personally I go for the second, but I can completely see why some people go for the first, and I completely respect that decision.. I just think it's very unfortunate that Edexcel forces the choice on us.

Sorry if I came over as a bit brusque in my first posting; no offence was intended, and I really hope none was taken. Now it's 3.10 a.m, and I really think I must go to sleep before I put my foot in it again.

Arsey, if i did not include the zeros in the venn diagram how many marks will i lose if any? I thought it wouldve been implied


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