"A researcher wishes to determine the effects of an outdoor adventure summer camp on the self-concept of inner-city boys. Boys are randomly assigned to the summer camp and to a control situation. The experimental treatment is for three months. A secondary purpose is to see if age (ages 6, 9, and 12) affects the relationship of the camp effects and self-concept." The researcher states that self-concept is represented by scores on the Tennessee Self Concept Scale. This is an example of a(n)

The appropriate answer will be "Operational definition".

Explanation:

So that the given scenario is an example of "Operational definition."

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."