Feelings of can undermine group members’ performance on iq tests.
a. self-fulfilling prophecy
b. gender bias
c. culture
d. stereotype vulnerability

d. stereotype vulnerability

Explanation:

Hi! The stereotypes that people drag can negatively affect their performance in IQ tests. Feeling vulnerable by some outside pattern, commonly false and non-Scientifique that make damage, in this case in the intelligence, affects the person in their performance.

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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.