How to Understand & Calculate Statistical Significance [+ Example]

Recently, I was preparing to send an important bottom-of-funnel (BOFU) email to our audience. I had two subject lines and couldn‘t decide which one would perform better. Naturally, I thought, “Let’s A/B test them!” However, our email marketer quickly pointed out a limitation I hadn’t considered: At first, this seemed counterintuitive. Surely 5,000 subscribers was

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