Have you tried looking in HELP index for TTEST

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Don Guillett
SalesAid Software

"Anita" wrote in message
...
Hello

I have a support call to do for one of my customers. He is using a
function
called Ttest. Unfortunately I have no knowledge on statistics so I don't
even know what a ttest is ! The formula result has E-15 after it and he
wants to know what that means and whether it is normal? He also wants to
calculate probability. Does this make any sense to anyone? I can provide
more info. if need be.

The version is 2000.

Many thanks

Anita