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# S2 help watch

1. Can someone explain what the mark scheme has done i don't get it.

Why have the multiplied 50/49 by s^2? For sigma^2?

Thanks
http://m.imgur.com/QovjnOS,5RN8ML6,ZqxWmVv
2. (Original post by Super199)
Can someone explain what the mark scheme has done i don't get it.

Why have the multiplied 50/49 by s^2? For sigma^2?

Thanks
http://m.imgur.com/QovjnOS,5RN8ML6,ZqxWmVv
It'd be lovely if you could give us the question as well...
3. (Original post by Zacken)
It'd be lovely if you could give us the question as well...
Scroll down, question 6.
4. (Original post by Zacken)
It'd be lovely if you could give us the question as well...
q6 babe sorry x
5. (Original post by EricPiphany)
Scroll down, question 6.
(Original post by Super199)
q6 babe sorry x
Sorry, didn't scroll down.
6. (Original post by Super199)
Can someone explain what the mark scheme has done i don't get it.

Why have the multiplied 50/49 by s^2? For sigma^2?

Thanks
http://m.imgur.com/QovjnOS,5RN8ML6,ZqxWmVv
The markscheme's just making use of the fact that your sample variance is in a different way.
7. (Original post by Zacken)
The markscheme's just making use of the fact that your sample variance is in a different way.
Yh but I dont get 2.1?
8. (Original post by Super199)
Yh but I dont get 2.1?
, what does that get you?
9. (Original post by Zacken)
, what does that get you?
50/49? g
10. (Original post by Super199)
50/49? g
Yeaaah, that's the correct answer.
11. (Original post by Zacken)
Yeaaah, that's the correct answer.
Yh mate that wasn't the issue. Issue was the z value how do you get 2.1?
12. (Original post by Super199)
Yh mate that wasn't the issue. Issue was the z value how do you get 2.1?
13. (Original post by Zacken)
Ah right yh got it.
Do you mind helping me with another.

I dont get when you do C-80 or 80-C? On the top. Like they have done 80-C in this case. Thanks
Q7i

http://m.imgur.com/KaaeSRH
14. (Original post by Zacken)
I hope we don't have to know these formulae for Edexcel, because I haven't seen them lol
15. (Original post by EricPiphany)
I hope we don't have to know these formulae for Edexcel, because I haven't seen them lol
It's S3 for us.
16. (Original post by Super199)
Ah right yh got it.
Do you mind helping me with another.

I dont get when you do C-80 or 80-C? On the top. Like they have done 80-C in this case. Thanks
Q7i

http://m.imgur.com/KaaeSRH
If I'm understanding you well then: it's means and then it's
17. (Original post by Zacken)
It's S3 for us.
Phew, thanks
18. (Original post by Zacken)
If I'm understanding you well then: it's means and then it's
So are we looking at H1 here? and since it says mu<80? so it's 80-c?. But if it was mu>80 it would be c-80? Or have I got the wrong end of the stick.

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