Terminology

Symbol Pronunciation Meaning

µ mu population mean

σ2 sigma squared population variance

σ sigma population standard deviation

𝑥 x-bar sample mean

s2 s squared sample variance

s s sample standard deviation

N N total number in population

n n total number in sample

Terminology

Symbol Pronunciation Meaning

z z test value for a normal distribution

t t test value for a t-distribution

p p-value significance probability

α alpha level of acceptable significance

r r sample correlation

R2 r squared coefficient of determination

R r population correlation