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# S2 Approximations

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1. Can someone check these/ tell me the rest as I can't seem to find them.

Approx to normal

- Binomial to normal
np and nq >5

-Poisson to normal
lamda > 15 large n

Approx to poisson

- Binomial to poisson
n large, p small

- Normal to poisson
I'm not too sure on this one. Is it when the mean and the variance are the same?

Approx to binomial

Cheers
2. (Original post by Super199)
Can someone check these/ tell me the rest as I can't seem to find them.

Approx to normal

- Binomial to normal
np and nq >5

-Poisson to normal
lamda > 15 large n

Approx to poisson

- Binomial to poisson
n large, p small

- Normal to poisson
I'm not too sure on this one. Is it when the mean and the variance are the same?

Approx to binomial

Cheers
What would you approximate to a binomial?
3. (Original post by Zacken)
What would you approximate to a binomial?
Idk? Discrete stuff lol?
4. (Original post by Super199)
Idk? Discrete stuff lol?
Do you have any examples?
5. (Original post by Zacken)
Do you have any examples?
Na. I thought there may be a rule for approximating to binomial
6. (Original post by Super199)
Na. I thought there may be a rule for approximating to binomial
Nope.
7. Is there only 3 approximations then, binomial to normal, binomial to poison and poison to normal. Thanks
8. (Original post by Bobby21231)
Is there only 3 approximations then, binomial to normal, binomial to poison and poison to normal. Thanks
At A-Level, yeah.
9. (Original post by Zacken)
At A-Level, yeah.
Ok thanks

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