A cognitive psychologist believes that people learn better when they spread out their studying over several days, so she creates a study with three groups of participants. each group studies the same list of 120 chinese vocabulary words (none of the participants had studied chinese before. one group studies the words for 20 minutes on the first day. the second group studies the words for 20 minutes on the first and second days. the last group studies the words for 20 minutes on the first, second, and third days. on the fourth day, all of the participants are tested on how well they
