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# OCR S2 sampling. Need some help! watch

1. (Original post by aymanzayedmannan)
Scroll down to sampling here. Do you believe it's incorrect?
I guess the key is that if it's discrete then that continuity correction is required.
2. (Original post by Zacken)
I guess the key is that if it's discrete then that continuity correction is required.
damn, this has me concerned for our spec now.
3. (Original post by iceabbey)
I don't think so. Because there is a unknown sample size n and will affect the continuity correction.
4. (Original post by iceabbey)
Thx a lot. This is my working.
Attachment 510689
Check your tables again, 0.999 does not correspond to 2.999. Then your method is correct.
5. (Original post by tinkerbella~)
Check your tables again, 0.999 does not correspond to 2.999. Then your method is correct.
Yeah I think it's something to do with the table. However the one I got only have values up to 2.999. When I use 3.0902 instead my answer became 81.2. Which surprisingly can be round up to 82!! thank you!
6. (Original post by iceabbey)
Yeah I think it's something to do with the table. However the one I got only have values up to 2.999. When I use 3.0902 instead my answer became 81.2. Which surprisingly can be round up to 82!! thank you!
Are you using the standard OCR one? You want to be looking at the critical values at the bottom, it gives 0.999 as one of them
7. (Original post by tinkerbella~)
Are you using the standard OCR one? You want to be looking at the critical values at the bottom, it gives 0.999 as one of them
Tbh that is the first time I ever notice that, thx a lot. Can not imagine what will happen if I don't know that when I am having my exam.
8. (Original post by iceabbey)
Tbh that is the first time I ever notice that, thx a lot. Can not imagine what will happen if I don't know that when I am having my exam.
At least you know that they're there now! and you knew what to do for the question (despite us lot telling you stupid things ) so it wasn't a big problem. If it makes you feel any better, I completely forgot about the existence of the Poisson tables in a mock before Christmas
9. (Original post by tinkerbella~)
At least you know that they're there now! and you knew what to do for the question (despite us lot telling you stupid things ) so it wasn't a big problem. If it makes you feel any better, I completely forgot about the existence of the Poisson tables in a mock before Christmas
That sounds terrifying. At least it's only a mock lol.
10. (Original post by iceabbey)
...
Sorry for being dumb and confusing you! Glad that tinkerbella (our resident maths fairy) sorted it out.
11. (Original post by Zacken)
Sorry for being dumb and confusing you! Glad that tinkerbella (our resident maths fairy) sorted it out.
Thanks for your helping as well!

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