Tag Archives: standard deviation

It takes ~20 observations to verify your first significant digit of the mean with confidence. Do you know how many observations it takes to verify your first sig-fig of the variance? More like 1000. And that’s just to get one … Continue reading

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Everybody knows that (referring to the sides of a right triangle). That formula tells you the straight-line distance on a flat plane. Say I walked three blocks east in a grid-style city and then four blocks north. Then I’ve traveled … Continue reading

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