The Excel T.DIST.RT Function
T.DIST.RT and TDIST functions
The TDIST.RT function is new to Excel 2010. This function (along with the new Excel 2010 T.DIST.2T function), replaces the old TDIST function, that is available in earlier versions of Excel. The T.DIST.RT function also has the advantage that, unlike the TDIST function, it can accept negative values of x. Therefore, if you have Excel 2010, you should use this function in preference to the TDIST function. Basic DescriptionThe Excel T.DIST.RT function calculates the right-tailed 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 :
T.DIST.RT( x, degrees_freedom )
where the function arguments are:
Example
Right-Tailed Student's T-Distribution with 10 Degrees of Freedom
The chart on the right shows the right-tailed Student's T Distribution with 10 degrees of freedom. If you want to calculate the value of this function at x = 1, this can be done using the Excel T.Dist.Rt function, as follows: =T.DIST.RT( 1, 10 )
This gives the result 0.170446566, or 17.04%. Similarly, if you want to calculate the value of the function, at x = -1, this can be done as follows: =T.DIST.RT( -1, 10 )
This gives the result 0.829553434, or 82.96%. Further information and examples of the Excel T.Dist.Rt function can be found on the Microsoft Office website. Common ErrorsIf you get an error from your Excel T.Dist.Rt function this is likely to be one of the following: Common Errors
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