Dr. Hao plans to conduct an experiment that studies the relationship between smartphone usage and anxiety. He will randomly assign some subjects to the control group in which they will use their phone as usual for a week, and the other subjects to the experimental group in which they will not be allowed to use their phone at all. He will measure the anxiety levels in the two groups at the beginning and end of the study and compare them to see if anxiety levels decreased in the experimental group. In this research, smartphone usage is the .

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.

answer; cultural trait;

answer; validity;

answer; does not include a reference to the audience;