Forbes magazine created the new phrase "daddy stress" in an article to explain the phenomenon discussed by penny parker in "double daddy."

The answer is true. The phenomenon of “daddy stress”—as Forbes magazine called it in a latest cover story—touches men from the decision-making office to the rank and file, and while a increasing number of single dads may feel it most, wedded fathers are hardly resistant.

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.