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    Non-parametric sample size requirements: per group, or overall?

    Hello, Hopefully this is a reasonably straightforward question that belongs in this forum but I was wondering whether the sample size requirements (i.e. not too small to be <3-6) for non-parametric methods such as the Mann-Whitney and Wilcoxon Signed Rank test refer to per group (such as each...
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    Population correlation coefficient sampling distribution

    Hello, When constructing a CI for population correlation coefficient (p), I am told you cannot use +/- 1.96 as the sampling distribution is non-normal? However, I am also told that each X and Y are assumed to be pairs of independent observations from a bivariate normal distribution? How come...