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FB A/B Tests Sample Size

Discussion in 'Facebook' started by Guac01, Apr 30, 2019.

  1. #1
    Hi,

    Hope someone could help me out.

    Before I created my A/B tests on Facebook, I used Optimizely's sample size calculator and found I needed a sample size of 5,000 per variation to reach 95% statistical significance. While I was setting up my campaigns, Facebook said the potential reach will be 100,000 so I thought I was safe.

    However, my campaign, which is 2 weeks long, is about to end and I only reached <300 per variation (which is well below the sample size needed to reach stat sig).

    What am I doing wrong & how could I avoid this next time?
    SEMrush
     
    Guac01, Apr 30, 2019 IP
    SEMrush