As far as I know, none of them is a vasodilator. May be you meant nicotinic acid,"niacin". It's the one that has a vasodilator effect.
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On the standard deviation. It has no effect on the IQR.
why?
impact
Statistical tests are designed to test one hypothesis against another. Conventionally, the default hypothesis is that the results were obtained purely by chance and that there is no observed effect acting on the observations - ie the effect is null. The alternative is that there IS an effect.
The effect of compound interest is that interest is earned on the accrued interest, as well as the principal amount.