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Mu
the mean average of a population

O^{2} sigma squared
variance of population

O Sigma
 standard deviation of population
 (square root of variance)

x
 x bar
 mean (average) of sample

s
standard deviation of sample

p
proportion of a population

phat
proportion of a sample

Mu _{x}
mean (average, or center) of the sampling distribution of the mean

mu _{phat}
mean of sampling distribution of proportion

O _{x}
 sigma xbar
 standard deviation of sampling distribution of mean

O _{phat}
standard deviation of sampling distribution of the proportion

