# TTEST(array1,array2,tails,type) returns the probability associated with a Student's t-test : TTEST « Statistical functions « Microsoft Office Excel 2007 Tutorial

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 Microsoft Office Excel 2007 Tutorial » Statistical functions » TTEST
21.76.1.TTEST(array1,array2,tails,type) returns the probability associated with a Student's t-test
 `If type equals 1, TTest is performed Paired`
 `If type equals 2, TTest is performed Two-sample equal variance (homoscedastic)`
 `If type equals 3, TTest is performed Two-sample unequal variance (heteroscedastic)`
 `Input the formula: =TTEST(A2:A10,B2:B10,2,1). Press Enter to get the result.`

Referenced from Excel Help

 21.76.TTEST 21.76.1. TTEST(array1,array2,tails,type) returns the probability associated with a Student's t-test