Between 1917 and 1962, georgia used a voting system that gave an unfair political advantage to rural areas and kept power in the hands of the democratic party. what was this system called?
a) the jim crow system
b) the two-party system
c) the dixiecrat system
d) the county unit system

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.