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Measures of spread: variance and standard deviation
Understand the model, recognise it in a stem, separate the look-alikes, then apply it.
01Memory anchor
SDStandard deviation, a measure of how spread out a set of numbers is.Read more → = spread of Data; SEMStandard error of the mean, a measure of how precisely a sample estimates the true average.Read more → = error of the Estimated Mean (smaller, shrinks with n).