Under Popular Sovereignty who is the source of power in a government?

Explanation:Popular sovereignty is the principle that the authority of a state and its government are created and sustained by the consent of its people, through their elected representatives (rule by the people), who are the source of all political power.

answer:

d. because dr. laguardia selected a widely used measure, his study generalizes to has strong external validity. external validity has limited external validity. other applications of this measure.

the widely used measure that he applied to his experiment was the benton facial recognition test. it employed on to football players and as result, only players who suffered brain concussions did not pas this test. and although it has an external validity, it is limited because it isn't general to apply to other population.