In statistics, a subset of people drawn from the larger group of all the people of interest is a

Why did television networks agree, in 1980, not to predict the winner of a state's electoral votes for president until all polls in that state had closed?

a. Prematurely publicizing a presidential winner could affect congressional, state, and local elections. b. Prematurely publicizing a presidential winner could introduce sampling errors. c. Prematurely publicizing a presidential winner could cause exit poll respondents to shade the truth about their voting choices in close elections. d. Incessant reporting of polling data drives viewership rates down.

Consider a situation in which Congress is not pleased with the direction taken by a federal agency. How can Congress punish  or otherwise exert control over that agency? 

A. By cutting its budget B. By deflecting interest to another issue C. By confirming a nominee to a top agency post D. By implementing one of the agency's programs E. By asking for a pocket veto