Table 103.5 displays notation for some of the commonly used symbols.
Table 103.5: 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 chisquare distribution with df 