# The TTEST Procedure

#### Common Notation

Table 106.5 displays notation for some of the commonly used symbols.

Table 106.5: Common Notation

Symbol

Description

Population value of (arithmetic) mean

Null value of test (value of H0= option in PROC TTEST statement)

Population variance

Population value of standard deviation

Population value of geometric mean

Population value of coefficient of variation (ratio of population standard deviation and population arithmetic mean)

Value of ALPHA= option in PROC TTEST statement

pth percentile of t distribution with degrees of freedom (df)

pth percentile of F distribution with numerator df and denominator df

pth percentile of chi-square distribution with df