Who is the head of the judicial branch of the u. s. government?

The Supreme Court is the head of the judicial branch. Unlike a criminal court, the Supreme Court rules whether something is constitutional or unconstitutional—whether or not it is permitted under the Constitution. On the Supreme Court there are nine justices, or judges: eight associate justices and one chief justice. hope this helps love :)

Explanation:

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.