x,deg_freedom,cumulative!Returns the left-tailed Student's t-distribution!is the numeric value at which to evaluate the distribution!is ...

!x,deg_freedom,cumulative!!Returns the left-tailed Student's t-distribution!is the numeric value at which to evaluate the distribution!is an integer indicating the number of degrees of freedom that characterize the distribution!is a logical value: for the cumulative distribution function, use TRUE; for the probability density function, use FALSE!