If a participant has an expectation that a certain experimental manipulation will have an effect, the research can be biased by

In using a matched-subjects design, it is important to remember that matching on more than one continuous variable

A) is difficult to accomplish and will usually result in significant participant loss. B) is preferred to matching on dichotomous variables. C) is difficult to accomplish and usually results in skewed distributions. D) often confounds the results if the variables are strongly related to performance on the dependent measure(s).

Paralleling the spread of democracy, since the 1980s there has been the transformation from:

A. free-market economies to socialist economies. B. mixed economies to collectivist economies. C. open economies to closed economies. D. command economies to market-based economies.