Sample Size

[Flymo]

Thank you, this is exactly the answer I was interested in and why I asked the question here.

I vaguely recall these terms of which you speak, from a previous lifetime  :P

Woohoo!  Only 8500 to go...
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There is another way of doing this if you calculate the mean and standard deviation (sd) of your sample of N results. To within a 95% confidence limit, the lower bound of your value is mean - (sd / sqr (N)) * 1.96 and the upper bound is mean + (sd / sqr (N)) * 1.96.