# OCR Stats 1 - Where do I start?

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#1
Hi. I'm totally stumped on stats and I don't know where to start. I normally revise by doing papers and going through and reading and repeating notes, but I don't have a clue with stats 1. I can normally work questions backwards but I just can't see a trend in questions or find a way to figure out what the question wants from me.

I got 87UMS in C1, and so far i'm getting generally 90%+ on papers on the stuff we've done (everything except integration and logs), so the fact that I could go from a brilliant A to something like a C (i'm sitting on Es in stats) is a huge concern, especially when everybody else finds it easy.

I also can't tell the difference between perms and combs.

Heeeeelp D:
0
9 years ago
#2
Have you been working form the OCR Stats 1 textbook? I've found their explanations pretty helpful - and I'm not at school anymore, I'm just studying for AS maths independently so have relied on the textbooks to learn the course.

Which other parts are you having trouble understanding? with permutations and combinations - think of the group of letters 'A B C D' - there are 4! permutations, because there are 4!=24 ways of arranging the four letters, in other words, the order of the letters is important here. You calculate it as "4P4" using the nPr button on the calculator.

But with combinations, there is only one combination - A B C D. The order that the letters are in is insignificant, whether is BACD, CADB... it's just those same four letters. You would calculate it as "4C4" using the nCr button on the calculator.

sorry if that seemed a little over-simplified - reading your post again, is it more that you can't tell the difference between perms and combs when given an exam question? or just in general?
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4 years ago
#3
I'm teaching myself S1 this year instead of doing m2 ... does anyone have an OCR S1 advanced maths essentials textbook/revision guide thingy ... it has a cd and a book ... I their guide with CD for M1 and it was amazing (went from U to an A on my own!) ... I know they do it but its not available to buy presumably because this is the last year of this spec? PLEASE LET ME KNOW I REALLY NEED ONE and would love to take it off your hands if you're finished
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