Something I've been thinking about

[Oct0puz]

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ummm.... to your first point ?? I'm calculating the variances of the data set of numbers. It tells us about the distribution. Which is what you want to know. Preferably, you'd like to calculate the skewness to figure out which sample is the best. Because you want one that is right skewed.

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I don't understand what you are trying to say, but you are wrong about the variance

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To answer the second point. There's two different formula's for the variance of a sample or the variance of a population. edit: The fact we know "everything about the population" means that we're calculating the variance of a population.

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Population variance and sample variance is something you use when you want to estimate the real variance. In this case we know the variance, so please do not refer to these.