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Square roots and √n: SD and the standard error

The standard deviation as √s², the standard error s/√n and why 4× the data halves it, the standard error of a proportion, the minimum detectable effect, the paired t and the finite-population correction.

Lesson 14 of 36~25 min of learningIncludes ~15 min for questions and tasks

Read the theory (8 cards)
A big square tile unrolls into one edge, and a range marker narrows as a crowd of dots grows larger.