Why would a country impose a quota? A
In order to encourage international trade
B
In order to encourage citizens to purchase foreign products
C
In order to encourage citizens to purchase domestic products
D
In order to force another country to changes its political policies

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paul revere would be your answer : )

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.