Significance Level is the probability that an effect happened by chance. ![]() For example you have two Subject lines for an email campaign and you want to test out and see what will be your conversion rate on either, what should your sample size be?īefore every test we formulate a null hypothesis which postulates the conversion rate of both subject lines will be the same.īefore running the experiment you need to establish three criterias: Digital has opened the floodgates for A/B testing and you can test pretty much everything. Sampling is needed mostly for A/B testing since you can’t test the true population most of the time so you need to test a sample population of your users.
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