The Excel T.INV function calculates the two-tailed inverse Student’s T Distribution, which is a continuous probability distribution that is frequently used for testing hypotheses on small sample data sets.
Syntax: T.INV( probability, degrees_freedom )
Where the function arguments are:
|probability||–||The probability (between 0 and 1) for which you want to evaluate the inverse of the two-tailed Student’s T Distribution.|
|degrees_freedom||–||The number of degrees of freedom (must be ≥ 1)|
T.Inv Function Examples
The chart on the right shows the left-tailed Inverse Student’s T Distribution with 10 degrees of freedom.
If you want to calculate the value of this function for a probability of 0.25, this can be done using the Excel T.Inv function, as follows:
=T.INV( 0.25, 10 )
This gives the result -0.699812061.
T.Inv Function Errors
If you get an error from your Excel T.Inv function this is likely to be one of the following :
|#NUM!||–||Occurs if either The supplied probability argument is ≤ 0 or > 1 or the supplied degrees_freedom argument is < 1|
|#VALUE!||–||Occurs if either of the supplied arguments are non-numeric|