The T.INV function calculates the one-tailed inverse Student's T-Distribution. This function is new to Excel 2010, and so is not availiable in earlier versions of Excel.
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.
The format of the function is :
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)|
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.
Further information and examples of the Excel T.Inv function can be found on the Microsoft Office website.
If you get an error from your Excel T.Inv function this is likely to be one of the following :
Occurs if either:
|#VALUE!||-||Occurs if either of the supplied arguments are non-numeric|