Tcdf
Tcdffunc
Description
Computes the probabilities of the specified tail type tail, associated with a cumulative distribution function of Student's tdistribution with the degree of freedom df.
Syntax
double prob = tcdf(double t, double df[, int tail])
Parameters
t
 Input, the value of the Student's variate.[]
df
 Input, the degrees of freedom, , of the Student's tdistribution.()
tail

Input, Optional. The tail probability type using for the Student's tdistribution
 1 = the for upper tail probability
 2 = the lower tail probability (Default if not set)
 3 = the two tail (significance level) probability
 4 = the two tail (confidence interval) probability
prob
 Output, the probability.
Example
tcdf(38.9036068506926,30, 3)=; // ANS: 3.110454711125E27