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# What is T.INV function in Excel?

T.INV function is one of Statistical functions in Microsoft Excel that returns the left-tailed inverse of the Student’s t-distribution.

## Syntax of T.INV function

T.INV(probability,deg_freedom)

The T.INV function syntax has the following arguments:

• Probability: The probability associated with the Student’s t-distribution.
• Deg_freedom:  The number of degrees of freedom with which to characterize the distribution.

## Explanation T.INV function

• If either argument is nonnumeric, T.INV returns the #VALUE! error value.
• If probability <= 0 or if probability > 1, T.INV returns the #NUM! error value.
• If deg_freedom is not an integer, it is truncated.
• If deg_freedom < 1, T.INV returns the #NUM! error value.

## Example of T.INV function

Steps to follow:

1. Open a new Excel worksheet.

2. Copy data in the following table below and paste it in cell A1

Note: For formulas to show results, select them, press F2 key on your keyboard and then press Enter.

You can adjust the column widths to see all the data, if need be.

 Formula Description Result =T.INV(0.75,2) The left-tailed inverse of the Student’s t-distribution with a probability of 75% and 2 degrees of freedom. 0.8164966