Which of the following research designs will allow cause-and-effect conclusions?

Hippocrates diagnoses one of his patients as suffering from an excess of phlegm. The

patient is probably ______. a. lethargic and sluggish c. confident and optimistic b. quick-tempered d. sad and depressed

Rebecca has an irrational fear of elevators and escalators to

the point that she has walked up 20 flights of stairs, while her older sister is afraid to leave the safety of her home. Rebecca and her sister each have a type of __________ disorder. a. anxiety b. dissociative c. somatic symptom d. personality