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…