Describe the various ways that African Americans attempted to help and improve their communities through activism.

https://www.naeyc.org/resources/pubs/yc/may2018/achievement-gap

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; the edward snowden leaks of nsa classified material;