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TIN
5
What was the main reason the Union set up a blockade along the Southern coasts?
so Confederate soldiers couldn't access the North by sea
to make it harder for the South to import and export goods
so Union soldiers could make sneak attacks on the South at night
to make it easier for Union spies to cover a large area of the South

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.