In the Study, Cited in the Text, of the Relationship

Multiple Choice

In the study, cited in the text, of the relationship between the amount of time a teacher spends smiling and the achievement level of the students, it was shown that

A) the less time a teacher smiles, the better the students do on an achievement test
B) the more time a teacher smiles, the better the students do on an achievement test
C) the time a teacher spends smiling is independent of student achievement
D) a smiling teacher causes a student to get better grades