About how many new laws does Congress enact each year?

How have the ideological positions of the two chambers of Congress shifted over the last two decades?

a. Both chambers have become more conservative. b. Both chambers have become more liberal. c. The House has become more conservative, while the Senate has become more liberal. d. The House has become more liberal, while the Senate has become more conservative.

This measure is the most comprehensive measure of variability, giving an "average" difference between all scores and the mean. It is called what?

A) median B) standard deviation C) Z-score D) mode