If Alex has been under a vague but persistent "cloud" of worry and a constant state of nervousness for nearly a year, he would be diagnosed with a conversion disorder

The original purpose of Social Security was to

a. create a way for seniors to pay for housing expenses b. provide a supplement to savings and other means of financial support. c. provide the primary source of income for those over age 65. d. create an investment opportunity.

One problem often noted about the experimental method is that

a. the behavior of the child in the laboratory may not reflect real-world behavior. b. it is difficult to assign participants to conditions randomly. c. cause-and-effect relationships cannot be determined. d. the independent variable often cannot be manipulated.