A.Score on a depression test
B.How long someone sleeps
C.How many times the people laughs
D.How many times a person helps someone else
E.One's grade on a test divided by how long you stud

____1.The researcher wants to determine how drugs affect a person's sense of humor.

___2.The teacher wants to find a way to help make Macky act more friendly toward the other children.

___3.A psychologist wants to know if his new form of psychotherapy will make people less depressed.

___4.I have to find a way to study more efficiently.

___5.Does this drug help people overcome their tiredness?​