At least _____ of patients on neuroleptic drugs experience muscle tremors and muscle rigidity at some point in their treatment.

The average girl matures about ________ before the average boy

A) six months B) one year C) two years D) three years

In Dr. Lu's study of eating disorders, she looked at the academic histories of girls with an eating disorder and girls who did not have such problems. In this example, the girls with eating disorders are the ________ group

a. comparison b. control c. criterion d. treatment