Ralph, a researcher, employs a confederate to push into a queue at a grocery store checkout counter in front of a person who is second and then another person who is ninth in line. he then records the number of verbal responses toward the confederate at each instance as a measure of aggression. the manipulation employed in this scenario is an example of a manipulation.

staged manipulation

Explanation:

When the events for experimenting are staged in the way that they manipulate the variables are said to be staged manipulation. Such manipulations helps in the creation of any particular psychological state of the participants. Also, they simulate certain situations which happen in real life.

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; goals and feedback are present;