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.
Input the formula: =TTEST(A2:A10,B2:B10,2,1)

Referenced from Excel Help

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