Who was the most powerful emporer to rule Rome before Nero? Join Zoom
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Trajan is one of Rome's most outstanding emperors and under his rule, the empire reached its peak. He is remembered as a successful soldier-emperor who presided over the greatest military expansion in Roman history, leading the empire to its maximum territorial extent by the time of his death.

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.