Dawn Wright

Ph.D. in Instructional Design and Development. Teaching statistics for Excelsior College and consulting. Zoomie class of '67.

Why is the Standard Error Equal to Sigma Divided by the Square Root of n?

Photo by Ken Treloar on UnsplashEvery time I teach the Central Limit Theorem, I get questions from students on why we divide the population standard deviation, sigma, by the square root of the sample size to calculate the standard deviation of the sampling distribution which we call the standard error. Recall that the equation for …

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