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# OCR MEI - S1 - 20th May 2015 watch

1. (Original post by danwilkins)
I did that too. You can leave it as a fraction or decimal can't you?
I think so. I've just seen in a past paper before mark down 1 if not put as rounded decimal but I think it's ok
2. Hm - never sure with stats. Section A was easy, section B was a little more challenging. Half my class got accept H1 for both and the other half got accept H0 then accept H1 - anyone know for sure? It looked as if it would be accept H1 for 1%, but anyone know for certain?
3. For the last question I just did 6/20 * 5/19 which gave me 3/38.

Quite sure this is correct because the third chocolate doesn't matter
4. What did everyone get for the second last one? I got 7/something
5. (Original post by JamesExtra)
I did that. You don't get marked down if you leave your answer as a fraction do you?
I don't think so
6. (Original post by JamesExtra)
What did everyone get for the second last one? I got 7/something
What question was that?
7. (Original post by alicec11)
What question was that?
I can't remember what the question was. It was the one before the very last question
Hm - never sure with stats. Section A was easy, section B was a little more challenging. Half my class got accept H1 for both and the other half got accept H0 then accept H1 - anyone know for sure? It looked as if it would be accept H1 for 1%, but anyone know for certain?
I got Reject H1 because it was outside the significance level ?
9. (Original post by Connorbwfc)
For the last question I just did 6/20 * 5/19 which gave me 3/38.

Quite sure this is correct because the third chocolate doesn't matter

last question was more than 2 to get a cherry wasnt it?

i did 6/20 to get it first time + 14/20*6/19 and added them together then took it off
10. (Original post by alicec11)
I got Reject H1 because it was outside the significance level ?
Same that would mean changing it to 5% would have no effect wouldn't it?
11. (Original post by danwilkins)
I did that too. You can leave it as a fraction or decimal can't you?

because it asked at least 2 cherries before other chocolates that he likes..
Let cherries be C and others be B
the possibilities of not getting at least 2 cherries be4 other chocolate would be
CB
BC
BB
i did 1- P(CB+BC+BB)
I am probably wrong ..
12. hypothesis test, null is kept in first test. Null rejected in second due to being lower than sig level
13. (Original post by Connorbwfc)
For the last question I just did 6/20 * 5/19 which gave me 3/38.

Quite sure this is correct because the third chocolate doesn't matter
I think so too, as it said 'more than 2 attempts' to get one he liked (a non-cherry).
14. (Original post by JamesExtra)
I can't remember what the question was. It was the one before the very last question
I did P(getting 3 oranges)x P(getting 3 oranges)
15. Told you two tailed tests wouldn't come up
16. (Original post by liverpool2044)
hypothesis test, null is kept in first test. Null rejected in second due to being lower than sig level
yeah that's what i did as well thanks for reassuring
17. So easy hahhahahaa you've got no fans

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18. (Original post by Bellbird)
I did P(getting 3 oranges)x P(getting 3 oranges)
What answer did you get? Was it 7/something?
19. Anyway swear down the hypothesis ting never came up ? That was a tree diagram m8

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20. (Original post by Fle)
Same that would mean changing it to 5% would have no effect wouldn't it?
Reject H1 in first question as it is outside sig level but reject H0 in the second part when its 5% sig because its smaller than 5% therefore there is sufficient evidence to suggest the new drug works.

Not really sure whether what I wrote for the justification was right - I just said that it was important to be really accurate with the drug as it was life saving?

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