In a study designed to investigate whether chimpanzees could learn sign language, four chimps were taught ten signs of American Sign Language. The study's goals were to determine if chimps learned some signs more easily than others, and if some chimps learned to sign more readily than others. Chimps were taught individually using a system of rewards until they could successfully produce unprompted responses on five consecutive occasions. The data are the times, in minutes, required to teach each sign to each subject. Are there differences amongst chimps and amongst signs? These data meet the assumptions of parametric statistics.