Talk:Standard deviation

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Incorrect diagram under section "Interpretation and application" ?[edit]

The red and blue populations are supposed to have mean = 100 but from inspection the red one clearly appears to have a lower mean.

Please use proper colors in the drawings[edit]

The chosen colors are like a color vision test. Please use distinct and bright colors, especially because of green, yellow and red being too close. It's more important to be accessible than to pick colors by other factors. Bright yellow, bright green and red, make it more accessible. Thanks. I am referring to this picture in particular: Variance_visualisation.svg

Confidence interval of a sampled standard deviation[edit]

This section could be more useful, it seems. Shouldn't it conclude with a formula like \frac{s}{\sqrt{2N}}? That's an estimate I've seen elsewhere for the variance in the standard deviation. I was hoping to confirm the formula and see a better explanation on Wikipedia.

The section actually lists confidence intervals in paragraph form. No formula. No graph. Not even a table. This is a weird section. Spiel496 (talk) 21:51, 20 November 2015 (UTC)