# WorksheetFunction.T_Dist_RT (Excel)

Returns the right-tailed Student t-distribution where a numeric value (x) is a calculated value of t for which the Percentage Points are to be computed. The t-distribution is used in the hypothesis testing of small sample data sets. Use this function in place of a table of critical values for the t-distribution.

If any argument is non-numeric, T_Dist_RT returns the #VALUE! error value. If degrees_freedom < 1, T_Dist_RT returns the #NUM! error value. The degrees_freedom and tails arguments are truncated to integers. If tails is any value other than 1 or 2, T_Dist_RT returns the #NUM! error value. If x < 0, T_Dist_RT returns the #NUM! error value. If tails = 1, T_Dist_RT is calculated as T_DIST_RT = P(X>x), where X is a random variable that follows the t-distribution. If tails = 2, T_Dist_RT is calculated as T_DIST_RT = P(|X| > x) = P(X > x or X < -x). Because x < 0 is not allowed, to use T_Dist_RT when x < 0, note that T_DIST_RT(-x,df) = 1 – T_DIST_RT(x,df) = P(X > -x) and T_DIST_2T(-x,df) = T_DIST_2T(x df) = P(|X| > x).

T_Dist_RT (Arg1, Arg2)

``````
Dim dblArg1 As Double: dblArg1 =
Dim dblArg2 As Double: dblArg2 =
Dim dblT_Dist_RT As Double
dblT_Dist_RT = WorksheetFunction.T_Dist_RT(Arg1:=dblArg1, Arg2:=dblArg2)
``````

## Arguments

Arg1, Arg2

Arg1 (Double) - X - The numeric value at which to evaluate the distribution.

Arg2 (Double) - Degrees_freedom - An integer that indicates the number of degrees of freedom.