What is the different
between social study
and social science​

Explanation:

The main difference between social science and social studies is in their intended purposes. The social sciences are branches of study that analyze society and the social interactions of people within a society. ... Social studies is the integrated study of the social sciences and humanities to promote effective citizenry.

The difference is they are both different subjects, As discussed above, the main difference between social science and social studies exist in their purpose; in social science, you study the society and social life of human groups while in social studies, you study both social science and humanities in order to promote effective citizenry.

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.