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Statistical Definitions
Symbol Name
Mu
Sigma Squared
Sigma
Delta
X Bar
Alpha
Beta
Description
Mean, or arithmetic average of a population
Variance of a population
Standard deviation of a population; square root of the
population variance
Effect size; difference between the mean of an experimental
group and a control group divided by the standard deviation
Mean, or arithmetic average of a sample, which is a subset of
the population; used to estimate the population’s mean
Variance of a sample; used to estimate the variance of a
population
Standard deviation of a sample; used to estimate the standard
deviation of a population
Probability of a Type I error
Probability of a Type II error
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