Mysterious & Bizarre Results

Unfortunately, this cataloger didn’t worry about statistical significance during testing. In his haste to achieve fast growth, he maximized the number of lists he could test by renting too few names from each list.

How few names are too few? Rule of thumb: If your results spreadsheet doesn’t show at least 50 orders from an individual group, then you don’t have statistical significance for that group, and you can’t count on the results from the group being repeatable.