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Sloan School of Management

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On this chart of a 'normal' distribution, showing the classic 'bell curve' shape, the mean (or average) is the vertical line at the center, and the vertical lines to either side represent intervals of one, two and three sigma. The percentage of data points that would lie within each segment of that distribution are shown.

Explained: Sigma

How do you know when a new finding is significant? The sigma value can tell you — but watch out for dead fish.

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Illustration of three white cars in a line, against a black background.

The case of the missing gas mileage

Automakers have made great strides in fuel efficiency in recent decades — but the mileage numbers of individual vehicles have barely increased. An MIT economist explains the conundrum.

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