T.TEST(array1, array2, tails, type)

Returns the probability associated with a t test.

array1The first array,
array2The second array.
tailsThe number of distribution tails:
1 = one-tailed distribution
2 = two-tailed distribution
typeThe kind of t-Test to perform:
1 = paired
2 = two sample equal variance (homoscedastic)
3 = two sample unequal variance (heteroscedastic)

Remarks

* Added in Excel 2010.
* This function replaces the TTEST function.
* For the Microsoft documentation refer to support.office.com

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