WorksheetFunction.T_Test Method (Excel)
Returns the probability associated with a Student t-Test. Use T_TEST to determine whether two samples are likely to have come from the same two underlying populations that have the same mean.
Version Information
Version Added: Excel 2010
Syntax
expression .T_Test(Arg1, Arg2, Arg3, Arg4)
expression A variable that represents a WorksheetFunction object.
Parameters
Name |
Required/Optional |
Data Type |
Description |
|---|---|---|---|
Arg1 |
Required |
Variant |
Array1 - The first data set. |
Arg2 |
Required |
Variant |
Array2 - The second data set. |
Arg3 |
Required |
Double |
Tails - Specifies the number of distribution tails. If tails = 1, T_TEST uses the one-tailed distribution. If tails = 2, T_TEST uses the two-tailed distribution. |
Arg4 |
Required |
Double |
Type - The kind of t-Test to perform. |
Return Value
Double
Remarks
If type equals |
This test is performed |
|---|---|
1 |
Paired |
2 |
Two-sample equal variance (homoscedastic) |
3 |
Two-sample unequal variance (heteroscedastic) |
If array1 and array2 have a different number of data points, and type = 1 (paired), T_TEST returns the #N/A error value.
The tails and type arguments are truncated to integers.
If tails or type is non-numeric, T_TEST returns the #VALUE! error value.
If tails is any value other than 1 or 2, T_TEST returns the #NUM! error value.
T_TEST uses the data in array1 and array2 to compute a non-negative t-statistic. If tails=1, T_TEST returns the probability of a higher value of the t-statistic under the assumption that array1 and array2 are samples from populations with the same mean. The value returned by T_TEST when tails=2 is double that returned when tails=1 and corresponds to the probability of a higher absolute value of the t-statistic under the “same population means” assumption.