Marcus visits a career planning website multiple times to complete a quiz to help him choose a career that fits with his personality. But, while he always gets the same score, the results seem vague and don't match what Marcus knows about his personality traits. He suspects there are problems with the quiz's _____________.

Alvin is a 10-year-old boy diagnosed with a mathematics disorder. His treatment plan will most likely involve a. teaching him different strategies to compensate for areas where he has difficulty. b. stimulant medication

c. developing an educational plan that exempts him from mathematics requirements. d. placing him in a school for learning disordered children.

Since 15 percent of a university comprises Asian-American students, a sample for a study was chosen in such way that it, too, consisted of 15 percent Asian-Americans. This kind of sample would be an example of a__________

A) random sample B) static sample C) crowd sample D) stratified sample E) Select