You design an experiment that manipulates the following variables: method of presenting material (visual, auditory); difficulty of material (easy, difficult); and amount of material (low, moderate, high). For a completely independent groups design with 10 participants per group, how many participants will you need?

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."

answer; self-serving bias;

c. 4, 3, 1 ,2. is correct

just took the test