Intellectual property rights are important to a free enterprise system because they: A. ensure that all companies benefit equally from new ideas.
B. help governments set prices for essential products.
C. prevent the courts from interfering with private businesses.
D. prevent companies from stealing ideas from innovators.

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.

where is the passage

answer; delirium is a common adverse reaction seen when elderly patients take diphenhydramine;