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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 ?