“Ermintrude, Daisy and La vache qui rit may produce as much as 454 pints more [milk] each year than cows with no names” (Gammell, 2009). So began a news report about a study of 516 British dairy farmers, in which cows with names were found to produce more milk than cows without names. Why? Agriculture professor Catherine Douglas, one of the researchers behind this study, suggested that “Just as people respond better to the personal touch, cows also feel happier and more relaxed if they are given a bit more one-to-one attention.” What statistical test might she have used?