Sixteen-year-old alyssa speaks differently to her boss at work, her parents at home, and her friends at school. alyssa demonstrates an improved mastery of

answer; john stuart mill's principle of utility is your answer; /// good luck

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.