Hi all, I'm wanting to try out PPC - but I am unsure how many impressions I need in a test before I can say the ad works or doesn't - how many would you suggest? I'd be targeting a 1% CTR initially. 100 impressions - 300 - 1000 - more? I'd like my tests to have some statistical validity so I could use the results to make PPC investment decisions. Thanks in advance for any advice Cheers