In the nineteenth century, which of the following is a power left to the states?

Why would it be important for a Democratic candidate to convince people such as Democratic governors and party leaders that he or she is the most electable candidate?

a. These leaders always generate good press for a candidate. b. These leaders may become super-delegates. c. Democratic governors are experienced at campaigning. d. Democratic Party leaders can decide who gets the final nomination. e. Democratic candidates need more reassurance from party leaders than Republican candidates.

Drews et al. (2008) manipulated driving conditions (i.e., driving while talking to a friend on the cell phone and driving while talking to a friend in the car) to see if this influenced the number of driving errors committed

Participants completed the task on a driving simulator. The simulator was used to increase which of the following? a. ecological validity b. convergent validity c. divergent validity d. construct validity