34.5 Seeing the Whole from a Sample: An Introduction to Statistical Inference
Point 5 of 5
34.5.5 The 3σ Rule
Core idea
Nearly all normal data falls within three standard deviations above and below the mean, and anything beyond that is extremely rare
Module goal. Understand why a small sample can speak for a large population, build the ideas of estimation and sampling variability, and prepare the ground for correlation and testing
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