OK, I understand why it makes more sense to use the normal distribution, on
our hundreds of thousands of records, but my boss is not convinced - mabye
because he knows the Poisson distribution is skewed to the left, and he said
something about getting higher probabilities than 97%. I dunno. Maybe
the purpose has to do with improving performance.

My question now is, can Excel generate one-tailed confidence intervals for
the Poisson distribution? In other words, is there a way to plug a
level of probability you want to achieve in and have it give you the number
of records one has a 99% probability of achieving?

If not, what plugins for Excel are available to accomplish that - without
needing to know visual basic or something to use them?

I have an idea not, but I'm double checking.

--
Yours,
Dora Smith
Austin, TX