Anita -

Search Excel's Help for "ttest" and for "scientific notation" or "scientific
format."

For more information about t-test, consult a statistics textbook.

- Mike
www.mikemiddleton.com

"Anita" wrote in message
...
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