PROC TTEST: Common Notation :: SAS/STAT(R) 9.3 User's Guide

Table 95.4 displays notation for some of the commonly used symbols.

Table 95.4 Common Notation
Symbol	Description
$\text{[math]}$	Population value of (arithmetic) mean
$\text{[math]}$	Null value of test (value of H0= option in PROC TTEST statement)
$\text{[math]}$	Population variance
$\text{[math]}$	Population value of standard deviation
$\text{[math]}$	Population value of geometric mean
$\text{[math]}$	Population value of coefficient of variation (ratio of population standard deviation and population arithmetic mean)
$\text{[math]}$	Value of ALPHA= option in PROC TTEST statement
$\text{[math]}$	$\text{[math]}$ th percentile of $\text{[math]}$ distribution with $\text{[math]}$ degrees of freedom (d.f.)
$\text{[math]}$	$\text{[math]}$ th percentile of $\text{[math]}$ distribution with $\text{[math]}$ numerator d.f. and $\text{[math]}$ denominator d.f.
$\text{[math]}$	$\text{[math]}$ th percentile of chi-square distribution with $\text{[math]}$ d.f.

The TTEST Procedure