Returns the twotailed Student's tdistribution.
The Student's tdistribution is used in the hypothesis testing of small sample data sets. Use this function in place of a table of critical values for the tdistribution.
Syntax
T.DIST.2T(x,deg_freedom)
The T.DIST.2T function syntax has the following arguments (argument: A value that provides information to an action, an event, a method, a property, a function, or a procedure.):
 X Required. The numeric value at which to evaluate the distribution.
 Deg_freedom Required. An integer indicating the number of degrees of freedom.
Remarks
 If any argument is nonnumeric, T.DIST.2T returns the #VALUE! error value.
 If deg_freedom < 1, T.DIST.2T returns the #NUM! error value.
 If x < 0, then T.DIST.2T returns the #NUM! error value.
Example
The example may be easier to understand if you copy it to a blank worksheet.
How do I copy an example?
 Select the example in this article. If you are copying the example in Excel Online, copy and paste one cell at a time.
Important: Do not select the row or column headers.
Selecting an example from Help
 Press CTRL+C.
 Create a blank workbook or worksheet.
 In the worksheet, select cell A1, and press CTRL+V. If you are working in Excel Online, repeat copying and pasting for each cell in the example.
Important: For the example to work properly, you must paste it into cell A1 of the worksheet.
 To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Formulas tab, in the Formula Auditing group, click the Show Formulas button.
After you copy the example to a blank worksheet, you can adapt it to suit your needs.

A 
B 
Data 
Description 
1.959999998 
Value at which to evaluate the distribution 
60 
Degrees of freedom 
Formula 
Description (Result) 
=T.DIST.2T(A2,A3) 
Twotailed distribution (0.054645, or 5.46 percent) 

Note To view the result as a percentage, select the cell, and then on the Home tab, in the Number group, click the arrow next to Number Format, and click Percentage.