Hello

Can someone explain what this function does? I have to do a support call
for a customer and have never come across the Ttest function before. The
answer that I have in the cell containing the function has got E-15 after it
(which I don't understand either). I've also been asked how to calculate
probability. The version is 2000 - I can supply more detail if the above
isn't adequate.

Many thanks for your help.

Anita