Testing out different subject lines, layouts, copy, and images is key to your career college’s email marketing success, and today, the most popular testing method is an A/B test. In a traditional A/B test, you split your audience down the middle into two groups. One group gets 'Variation A' and the other group gets 'Variation B'. After a designated period of time or number of sends, results are compared and a statistically significant winner is determined (Haven't been determining statistical significance? There are many free tools online that make the calculation simple: https://www.kissmetrics.com/growth-tools/ab-significance-test/).