Which was a development that caused the U.S. bureaucracy to grow?

The use of a within-subjects design in a factorial experiment can do all of the following EXCEPT

A) provide greater sensitivity to the effects of the independent variable. B) assure equivalence of groups at the start of the experiment, because the participants in each condition are identical. C) require fewer participants and, as a result, be more efficient. D) reduce confounding due to sequence effects.

A major advantage of randomly selecting participants from a population is that

a. it allows you to do your study with fewer participants and still find statistical significance in your results. b. you can be more confident that it was the manipulation of the independent variable that caused the changes observed in the dependent variable. c. you can be more confident that your sample is representative of the population. d. it is more likely that your sample will have the characteristics you need it to have.