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Hi everyone - i have a problem which sounds like it should be an easy answer, but i am stumped - or maybe i am over analysing.

I have a client who has completed a test campaign - two cells of 50,000 and 75,000 respectively. The response rate is the same at 99% confidence - 0.47%, however the two cells received different creative and copy elements.

Initially we were looking for a increase in response - this has not happened, however, the spend of the responses is quite different - £35 versus £39 - average spend in the first 3 weeks of trading.

Q - I need to understand at what level this will be deemed statistically different.

Which formulae should i use ?

Thanks

Mike

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Comment by Michael Fisher on August 11, 2010 at 2:35am
Thanks - i had been trawling too many books and stats sites - got a big bogger down !
Comment by Ralph Winters on August 10, 2010 at 2:03pm
Do a web search on "difference between two means". The choice of test will depend up how rigorous your assumptions are.

-Ralph Winters

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