[Doctor.]

(Original post by Genesis2703)
Topics I find hard:
-Permutation/combinations, for cars etc.
-Greater than (>) for Geo's/Bio's I mess up sometimes
-Weird forms for showing data*

*Teacher gave us a sheet showing advantages/disadvantages of stem and leaf, histograms etc. as well as stuff on condition of binomials and geometrics, the 2 correlations and regression lines. Which I am trying to learn off by heart.

You sure you're not my twin? I get stuck on exactly the same as you The greater than for Geo, has been happening in a few of the past papers, never really had the problem before very annoying.

I plan going over + questions on Regression & Correlation tomorrow so should get some decent notes to put up on here!

[CMPUNK]

(Original post by George_)
Could somebody teach me the whole of Stats please?

LOL :P My teacher SUCKS for stats. I am so going to fail it.

ExamSolution.com <---- Your Virtual Teacher

[Doctor.]

(Original post by CMPUNK)
ExamSolution.com <---- Your Virtual Teacher

Not going to lie, but I've been on that site and frankly it is sort of on the sucky side

[CMPUNK]

(Original post by Doctor.)
Not going to lie, but I've been on that site and frankly it is sort of on the sucky side

i think he is great, well maybe he can change his personality he sounds like he has no charisma when he talks, but he explains it well

[Ataraxian-Walker]

I don't understand Normal distribution at all

[Genesis2703]

(Original post by Doctor.)
You sure you're not my twin? I get stuck on exactly the same as you The greater than for Geo, has been happening in a few of the past papers, never really had the problem before very annoying.

I plan going over + questions on Regression & Correlation tomorrow so should get some decent notes to put up on here!

Well greater than for Bio's arent that bad, but yeah for geo's I keep on overcomplicating it in my mind, or putting 1- where I don't need it.

Yay for correlation and regression, it isnt that bad really. I just wish they gave you more marks when you find the Product Moment correlation coefficient, it is normally only 3 marks.... yet I find it so tedious to do

[Doctor.]

(Original post by Genesis2703)
Well greater than for Bio's arent that bad, but yeah for geo's I keep on overcomplicating it in my mind, or putting 1- where I don't need it.

Yay for correlation and regression, it isnt that bad really. I just wish they gave you more marks when you find the Product Moment correlation coefficient, it is normally only 3 marks.... yet I find it so tedious to do

I think in a few of the early papers, possible the 07 it was 5 marks a PMCC

Lol I do the same with geometrics, agreed that binomials aren't too bad. It's just sometimes my head doesnt make sense of it and I make a mess of it. The geometric ones are usually 2/3 marks, annoys me when I get it wrong It should have been easy marks!

(Can't upload any notes till I get my scanner back...dad decided he wanted to take it to work )

[Genesis2703]

(Original post by Doctor.)
I think in a few of the early papers, possible the 07 it was 5 marks a PMCC

Lol I do the same with geometrics, agreed that binomials aren't too bad. It's just sometimes my head doesnt make sense of it and I make a mess of it. The geometric ones are usually 2/3 marks, annoys me when I get it wrong It should have been easy marks!

(Can't upload any notes till I get my scanner back...dad decided he wanted to take it to work )

Yeah.... I dont want to lose marks on Geo's, when I know I could easily lose marks on the many "explain why" or "comment on" questions which come up a lot, a fussy examiner could cost me many marks on those questions... so I need to get all the MATHS right

Oh and Im on study leave, doing some C2 papers for friday at the moment (hence my quick reply).... ahh the lack of life I have

[isuruar]

Oh well, I am resitting this paper day after tomorrow!! I got a high C last time, just one mark below a B

Any advice for this paper?

[AishaTara]

let the revision and learning in my case commence !

[Doctor.]

(Original post by isuruar)
Oh well, I am resitting this paper day after tomorrow!! I got a high C last time, just one mark below a B

Any advice for this paper?

You sure you're doing OCR (not MEI)? The exam is quite a while away yet

[om-nom ._.]

does anyone have any general tips for this exam/ revision notes??
especially on permutations and combinations i can't do them at all!
really worrying about this exam, did a past paper and got a D

[Doctor.]

(Original post by om-nom ._.)
does anyone have any general tips for this exam/ revision notes??
especially on permutations and combinations i can't do them at all!
really worrying about this exam, did a past paper and got a D

I haven't done Permutations and Combination notes yet! Will be doing them tomorrow, will try post it up ASAP!

[om-nom ._.]

(Original post by Doctor.)
I haven't done Permutations and Combination notes yet! Will be doing them tomorrow, will try post it up ASAP!

thanks, that would be v. helpful!

[Doctor.]

Getting a little confused on the whole 'x on y' and 'y on x' regression lines. I can work out the regression lines, but what's the difference between them?

Anyone want to help?

[Genesis2703]

(Original post by Doctor.)
Getting a little confused on the whole 'x on y' and 'y on x' regression lines. I can work out the regression lines, but what's the difference between them?

Anyone want to help?

y on x, used when x is the independant variable and is the more common of the two, it is a best fit line that minimises the distances in points on a scatter graph in terms of differences in the y direction. It is used to estimate y given x and is written as y = a + bx

x on y is used when y is the independant variable, and minimises the scatter graph point differences from the line in terms of the x direction. It is used to estimate x given y and is written as x = a + by

If x is a CONTROLLED variable, the y on x regression line should be used to estimate y given x AND x given y.

Estimates from a regression line are reliable if...
A) Correlation is strong
B) Not extrapolating too far from the original data
They both meet at the point (mean x, mean y)

EDIT: Changed with correct information.

[bbm100]

how can you revise for conditional probability? it seems as though the questions only come up every other year - so not many practise questions - the questions are worded so horribly.

[Genesis2703]

(Original post by bbm100)
how can you revise for conditional probability? it seems as though the questions only come up every other year - so not many practise questions - the questions are worded so horribly.

Can you give an example of a question, I am not completely sure what you mean by "conditional" probabillity?

[Amy-Rose]

This might be a really silly question but what is this regression that people are speaking of, I did a mock the other day and got 85% so I'm doing alright but what is this regression stuff?

[Genesis2703]

(Original post by Amy-Rose)
This might be a really silly question but what is this regression that people are speaking of, I did a mock the other day and got 85% so I'm doing alright but what is this regression stuff?

In our text book it is a whole topic at the end, you sure you wer enot tuaght it??

well regression lines are in essense equations of lines of best fit, which can be found based off x and y data you have.

There are 2 different types and if you look a couple posts up I made a summary about them!