# Tagged Questions

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### When to use Central Limit Theorem?

Is the central-limit-theorem true for all distributions? For what sample size is it true (what is meant with "large")?
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### Nonparametric test statistics for non-equal sample sizes

If I have two samples, with one 30-times larger than the other, which nonparametric test statistics should be considered for checking the null of equal distribution? I am using Kolmogorov-Smirnov ...
353 views

### Sample size to detect exponential distribution

I'm not a statistician, so I hope this question makes sense. I'm an EMT and we have patients known to be "frequent flyers". Example, we have a diabetic that we have seen 100+ times in 3 years. I have ...
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### How many samples should be taken to capture the mean and variance of the original set with given error?

I have a set $S$ of $N$ real numbers. I wanna calculate the mean $m$ variance $v$ of $S$. But since $N$ is too large, I do not want to use all of the numbers. Instead, I would like to sample $n$ ...