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OCR MEI Statistcs 1 June 18th 2010 (post discussion)

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Reply 20

Darth Log

Does anyone have any tips for combinations and/or permutations? :smile:

Reply 21

gdunne42

xCHiiBiEverlastingx

Hi guys,
Just wanted to know what formulae we need to know off by heart? I think there's quite a few ones missing from the booklet, like standard deviation, method for finding outliers etc or they are phrased confusingly. Can anybody compile a list or something?

also, i am still seriously f-cked for hypothesis testing and binomial distribution... i hope its an good paper too!

This may help
formulae.pdf

good luck

Reply 22

Khay92

All the maths papers for OCR have been solid so far! hope this will be different...
Good luck every1

Reply 23

xCHiiBiEverlastingx

gdunne42

This may help
formulae.pdf

good luck

oddly enough it doesnt have standard deviation in it :/ but thanks anyway lovely, good luck to you too!

and about outliers, everybody check out jan 2008, it comes up there).
also someone posted this in another thread:
http://www.ocr.org.uk/download/kd/ocr_10096_kd_l_gce_spec.pdf (see p66 for S1, standard dev) :smile:

Reply 24

Ben77mc

http://mathshelper.co.uk/MEI%20S1%20Revision%20Sheet.pdf
not got everything, but is good

Reply 25

username340050

Chapter 1: Exploring Data:

MSD, RMSD, Standard Deviation, Variance, Measures of Central Tendancy (Have seen it plenty of times) and linear coding

Chapter 2: Data Presentation etc...:

Vertical Line Charts, Histograms, quartiles and CF Curves. And Chapter 1 questions on the graphs...

Chapter 3: Probability :shifty:

Tree Diagrams and Venn Diagrams....
P(AnB)
P(AuB)
P(B|A)
Independent Events and if Mutually exclusive
or... Conditional Probability :shifty:

Chapter 4: Discrete Random Variables

If you think about it, refer to Chapter 1.
E(x) works like "Sigma X * F"
And Var (x) = E(x^2) - E(x)^2.
And as said again, in Chapter 1.
E(x^2) is like "Sigma X^2 * F" when working out for Sum of Squares

Chapter 5: Further Probability:

Permutations is when number cannot be re-used and order counts
Combination is when number can be re-used and order doesnt count

Combination = n!/(n!-r!)n!
Permutation = n!/(n!-r!)

And the Use of nCr equation...

Chapter 6: Binomial Distribution

Easy to remember, just think of those racists.
B(n,p) and P(X= R)
N= Total Number mentioned in question
P = Probablity given or worked out
q = ! - P , used in nCr and finding an unknown value
R = Specific Number mentioned in question, eg: exactly onem then R= 1

Chapter 7: Hypothesis testing

One tail tests and two tail tests and critical regions

Just get through 1 tail, then two tail is just slight modification.

Yeah... I guess...
I havent listed everything down, but that is what you should ATLEAST know... I guess...

Any Exam Tips or whats likely to come up anyone?

Oh and, Hypothesis testing has ALWAYS came up from what I see...

Reply 26

xCHiiBiEverlastingx

Ben77mc

http://mathshelper.co.uk/MEI%20S1%20Revision%20Sheet.pdf
not got everything, but is good

beautiful. thanks a bundle. will rep when i can :wink:

Reply 27

Ben77mc

Faisal-Fm

Oh and, Hypothesis testing has ALWAYS came up from what I see...

Yeah, usually a seven marker.
S2 ones are worse - 12 marks for a hypothesis test!

xCHiiBiEverlastingx

beautiful. thanks a bundle. will rep when i can :wink:

no problem :smile:

is this mei?

How did everyone find it?

Reply 30

Teva

CW123

it was ok, did everyone accept the null hypothesis in q7? and the critical region was something like x greater than or equal to 5?

yeah, i got the same as you for both :smile:

Reply 31

CW123

Teva

yeah, i got the same as you for both :smile:

ah thats good :biggrin:

lets hope we're right. though im sure it was :smile:

Reply 32

username219321

Think that went better than the one I actually revised for haha :smile:

Made a mess of q7 at first as I forgot the binomial tables were P(X =< x), not P(X => x) but noticed after a bit haha :smile:

. Also made a bit of a mess of the histogram at first as I almost forgot about probability densities lmao.

Reply 33

xChelsea

Yeah, i wrote the same aswell.
hopefully that's right then.
What did you guys get for the last question?

Reply 34

cor898

CW123

it was ok, did everyone accept the null hypothesis in q7? and the critical region was something like x greater than or equal to 5?

Yay!
does anyone remember what they got for the very last question?
i think the question was P(10 00 would be on time given 12 00 was on time)

Reply 35

xChelsea

cor898

Yay!
does anyone remember what they got for the very last question?
i think the question was P(10 00 would be on time given 12 00 was on time)

I think i put something like 0.95

Reply 36

cor898

xChelsea

I think i put something like 0.95

I got 0.956
but wasnt too sure what to do
did you get p(10 and 12) as 0.8885 (or something like that) and then divide that by the answer you got in the previous question?

Reply 37

xChelsea

Yeah i got that '0.8885' aswell and i divided it by that.
ok i've forgot what i put for the final answer now because i think i got 0.95 from the probability on the tree diagram aha.
but yeah i worked it out the same.