We love when our clients test — and learn — something with their email marketing campaigns. From what works in subject lines to the length of the email to how to best use personalization, testing in email marketing is key to consistently increasing your results. But there’s an important caveat: All tests are not created equal. In order to really learn from your tests, they need to be both scientifically accurate and statistically significant results. Did that phrase take you back to college? It turns out that statistics class is […]