Z Scores and The Shape of the Distribution
This tutorial discusses the various shapes a data distribution can have, symmetrical or skewed. The normal distribution is explained, and the calculations for obtaining z scores is demonstrated. Chebyshev's theorem and its implications for the Empirical Rule is discussed, along with the rules that are derived for the proportion of values that lie between 1 standard deviation, 2 standard deviations, and 3 standard deviations from the mean.