What was Hitler's excuse for mass producing tanks, submarines, and planes in Germany, even though it went against the Treaty of Versailles? a
Germany needed a large army to defend itself from France.
b
Germany needed an economic boost.
c
Germany was only making planes to supply Great Britain's Royal Air Force.
d
None of these.

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.