Why Excel Ttest function and Data analysis Ttest Gives different Result ?

Question

[shamimasif2011]

I am trying to perform the t test in excel .When i do with Ttest function it gives different result .When i do the Test USing Data Anallysis Tool .It gives me different result .Which is correct ? Why it is giving different result at same time ?

[WouterDeCoster]

What's the Ttest function you are talking of and which Data Analysis Tool? You really need to provide more information.
Remember that we cannot see your screen, so include any formula or code you use. We also have no idea which data you are working on.