How do you know if your direct mail test results can be trusted? In this episode, Bethany MacKay explains why test cell size plays a critical role in generating reliable, repeatable insights. She breaks down the basics of statistical significance and offers practical tips for both new and experienced mailers. Find out how to size your test cells the smart way and improve campaign performance.

► To read the related blog article, visit: https://gundir.com/resource/gundirguide-to-test-cell-size/
► To get started with direct mail, visit: gundir.com