How μ(nB,B)-μ(nA,A)~N(0,σB²/nB +σA²/nA) became μ(nB,B)-μ(nA,A) divided by the square-root of σB²/nB…

The art of A/B testing
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Sylvain Truong
Yukio
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Mar 21, 2020
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How μ(nB,B)-μ(nA,A)~N(0,σB²/nB +σA²/nA) became μ(nB,B)-μ(nA,A) divided by the square-root of σB²/nB +σA²/nA and N(0,1)? I didn't understand this math.
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Written by Yukio1K Followers
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Mathematician with a master degree in Economics. Working as a Data Scientist for the last 10 years.
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