What does "Mu" mean?

Definition of Mu in the context of A/B testing (online controlled experiments).

What is Mu?

In statistics and probability theory the Greek small letter mu μ is used to denote a population mean or expected value. For example, the expected value of the mean under the null hypothesis would be denoted by μ0 while the expected value of the alternative hypothesis will be denoted by μ1. The observed value of mu will be simply μ.

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