Probability Distribution Functions

This screen computes the probability distribution functions and their inverses for four common statistical distributions. 
Note: Before using this page for the first time, make sure you read the JavaStat user interface guidelines for important information about interacting with JavaStat pages.

Normal (Gaussian)

z 
p 

Note: p is the area in the two tails of the distribution

Student t

t 
n 
p 

Note: p is the area in the two tails of the distribution

Chi Square

ChiSq 
n 
p 

Note: p is a "one-tailed" area (from ChiSq to infinity)

Fisher F

F 
n1 
n2 
p 

Note: p is a "one-tailed" area (from F to infinity)

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Send e-mail to John C. Pezzullo at johnp71@aol.com