Kevin, nearing 30 years old, is pondering his life during a conversation with his mother. "i just want to be happy when i'm old," he said. his mother told him about the berkeley longitudinal study, adding, "life satisfaction at age 70 was linked to at your age."

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.

it should be d or b but i'm sure it's d