Hi,
I wonder if anyone can please help me?
I have been asked the following question and just can't get my head around
how to answer it, it seems to be in the wrong order to the normal sample
size calculations that I know!
We have completed a mailing campaign A - it gave us a response rate of 10%.
We are about to do a mailing campaign B - we want it to give us a response
rate of 15%, but how many people do we need to mail to ensure that our seen
15% is significantly different from the 10% seen in mailing campaign A?
Any help anyone can provide will be greatly appreciated!
Thanks,
Carole Sanford.
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