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# Ocr mei statistics 1 exam thread (24/05/13) watch

1. (Original post by tumblrgirl)
when the hypothesis test is two tailed, you half the significance level don't you?
and also, how can you tell if it's meant to be two tailed or not because your hypotheses depend on it being two or one tailed so confused
Yes, if it's two tailed you half the sig level.
Also, the alternative hypothesis would be:
p is not equal to
And not:
p is greater than/smaller than

If you're a bit confused on two tailed tests check out this video:
http://www.examsolutions.net/maths-r.../example-5.php
2. I haven't even started revising for this, exams all this week except Monday...Going to start S1 revision in about 6 hours

C1 went okay, C2 was awful!
3. Hey Guys! I've done pretty awful in Core 1 and Core 2 so I'm hoping to do well in stats to bring my grade up! So, has anyone got any predictions of what could come up, so I can just go over bits and pieces again? Thanks

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4. (Original post by Uncreative)
I haven't even started revising for this, exams all this week except Monday...Going to start S1 revision in about 6 hours

C1 went okay, C2 was awful!
S1 is tomorrow..?!?

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5. Yes haha! 9am!
6. (Original post by tumblrgirl)
we got told that if the number is over 50, you don't have to add the one, you can just divide by 2 straight away. However, our teachers said last year, there was a median question and the number was below 50 so nobody added the one but they lost a mark because of that. So,...always use n+1/2 for the median, no matter how big or small the number is
Okay, but in a past paper i did n+1/2 & i got the median wrong as it was just n/2
7. (Original post by Uncreative)
I haven't even started revising for this, exams all this week except Monday...Going to start S1 revision in about 6 hours

C1 went okay, C2 was awful!
Me too. Fourth late night of cramming in a row...
8. For histograms when frequency density is on the y axis but you've scaled it to make the numbers more manageable, where do you put this information?

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9. (Original post by jo7777)
Me too. Fourth late night of cramming in a row...

Me too I went to bed at 12pm last night and woke up at 5am to do some revision! Horrible!!
10. Anyone have any simple ways to understand probability

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11. Two years ago since I did this- feels like yesterday
12. So no one here understands Medians either
We're all doomed, lol
13. (Original post by DarkWillow)
So no one here understands Medians either
We're all doomed, lol
At least if we're all doomed, the grade boundaries will be low!

every cloud has a silver lining
14. (Original post by DarkWillow)
So no one here understands Medians either
We're all doomed, lol
its messed up, some ms say n/2 then some say n+1/2
15. What is the correct formula to use for standard deviation? Every mark scheme has a different formula, it's stressing me out!
16. i always seem to get probablility questions wrong, I just never know what do to :c any tips anyone?

i'm preparing to fail
17. (Original post by zangorou)
What is the correct formula to use for standard deviation? Every mark scheme has a different formula, it's stressing me out!
the easiest one is (sum of x^2) - (n x mean^2)
divided by n-1
ALL SQUARED
18. Guys how do you find the minimum and maximum possible values of the midrange of a histogram?
Q1: http://www.mei.org.uk/files/papers/2011_June_s1.pdf
19. (Original post by zangorou)
What is the correct formula to use for standard deviation? Every mark scheme has a different formula, it's stressing me out!
I use
square root of (fx^2)-(n x mean^2) all divided by n-1
20. (Original post by jo7777)
Guys how do you find the minimum and maximum possible values of the midrange of a histogram?
Q1: http://www.mei.org.uk/files/papers/2011_June_s1.pdf
No worries...Get it now

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