__________ personality disorder has a relatively high recovery rate following early detection and therapy

In the past, demographers portrayed the United States population in the shape of a demographic ______

Fill in the blank with correct word

Dr. Cortez is carrying out an experiment dealing with the effects of caffeine on learning. His independent variable consists of two groups of college students, where one group receives 10mg of caffeine, and the other group receives 30mg of caffeine

The dependent variable consists of the frequency of items recalled correctly from a previously memorized word list. In this case, Dr. Cortez is hoping to find a. systematic variance from the extraneous variables. b. nonsystematic variance from the independent variable. c. systematic variance from the independent variable. d. none of the above