Jamie Smith tells marketers how to double their campaign's click-through rate with a scientific AdWords A/B test on ad copy. He walks through updating ad copy optimization settings, writing ad copy ...

Opinions expressed by Entrepreneur contributors are their own. A/B testing is often regarded as one of the most important components of any marketing strategy. After all, you won’t truly know whether ...

Opinions expressed by Entrepreneur contributors are their own. Scientists would never push a drug to market without testing it to make sure it is effective; a similar principle should be applied to ...