A research design that involves testing the same person in more than one condition is called a

A zero-sum game refers to the situation in which

a. one state can gain only at the expense of another. b. both states can gain at the same time. c. neither state can gain and both will lose. d. both states can cooperate with one another.

The U.S. Postal Service used to be a government corporation, but in the early 1970s it was transformed into a private corporation.

A. True B. False