OCR MEI - S1 - 20th May 2015

Discuss.

(edited 8 years ago)

Reply 1

I need help with the two tailed tests! I'm so bad at theme don't undertanad IT at all can anyone help pls?

Reply 2

DashDotDotDash

Does anyone have any good sources for revision on this exam?
I'm retaking this exam from last year and I honestly cannot remember any of it. I fine that overall MEI OCR Maths doesn't have enough resources anyway, let alone anything that isn't Core _..

Reply 3

corey7695

11

Original post by DashDotDotDash

Does anyone have any good sources for revision on this exam?
I'm retaking this exam from last year and I honestly cannot remember any of it. I fine that overall MEI OCR Maths doesn't have enough resources anyway, let alone anything that isn't Core _..

I'm just doing a load of past papers

Reply 4

DashDotDotDash

Original post by corey7695

I'm just doing a load of past papers

I think I might to the same, I like to make notes and then do it, (especially as I actually have no idea)
But I just cant find any good materials to make notes from,
So I'm just gonna do past papers with the book (-this is what happens if you retake and don't study in your own time kids)

Reply 5

McDerdactyl

9

Original post by DashDotDotDash

Does anyone have any good sources for revision on this exam?
I'm retaking this exam from last year and I honestly cannot remember any of it. I fine that overall MEI OCR Maths doesn't have enough resources anyway, let alone anything that isn't Core _..

I find integral maths is a really good website for specific topic questions, if you dont have a login you could use mine as ive already let a few people use it already because its really useful, just message me.

Reply 6

xoharrypotter

13

http://vle.woodhouse.ac.uk/topicdocs/maths/PastPapersfile/S12014May.pdf

2014 paper, it took me a while to find it so im sharing it here x

Reply 7

¡Muy bien!

14

What are point probabilities?

Reply 8

yes i'm also doing this, im using the cgp guide nd past papers

Reply 9

Original post by ¡Muy bien!

What are point probabilities?

Do we even have to know about them never heard about them during this course

Reply 10

Do we need to know how to calculate the median from a grouped frequency table?

Reply 11

Original post by anonymousADHD

Do we need to know how to calculate the median from a grouped frequency table?

Yeah it's called linear interpolation :ahee:

Reply 12

Original post by Azula

Yeah it's called linear interpolation :ahee:

Oh gosh what really? How are you suppose to do that?!

Reply 13

ABeingOnEarth

15

does anyone reckon histograms will come up? or hypotheses testing/critical regions?

Reply 14

Original post by IGCSEKid

does anyone reckon histograms will come up? or hypotheses testing/critical regions?

They come up like every year :colonhash:

Reply 15

Original post by anonymousADHD

Oh gosh what really? How are you suppose to do that?!

I hope that helps :awesome:

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Reply 16

zirak46

8

I struggled with two tailed just two days ago but I hacked it haha
Okay so firstly, you need to know hypothesi testing for significance levels & critical region
One tail involes (lets say prob is 0.5)
Ho : p = 0.5
H1 : p > 0.5 OR p < 0.5 (depending on ques, as you probs know)
and then you either do sig level version:
In the ques you get x value (say its x = 14)
if p > 0.5 then P(X>/14)
if p < 0.5 then P(X</14) that means less than equal to btw haha
Now whichever it is, you compare to sig level (has to be below it)

or do critical region version:
if p > 0.5 then compare to high tail of critical region (trial & error)
if p < 0.5 then compare to low tail of critical region (both have to be below it)

For two tail testing, it involves:
Ho : p = 0.5
H1 : p DOESNT EQUAL 0.5
and then you do same thing but for sig level version:
-you HALF sig level
e.g. so say x = 12 and its two tail and sig level is 5% (0.05)
it'll be P(X</12) compared to 0.025

for CR version:
-you HALF sig level
-you do for both p > 0.5 AND p < 0.5
e.g. say sig level is 5% (0.05) and X~B(20, 0.5)
-check on tables for biggest n value for where P(X</ something) is less than 0.025
-check on tables for biggest n value for where P(X>/ something) is less than 0.025

Hope that made sense, if not, send a question & I'll happily do a question for you explaining all
Good luck

Reply 17

LilJon

is it guaranteed there will be a hypothesis test?

Reply 18

megan*kate