Dr. Gavin decides that instead of conducting a 2 × 4 between-subjects factorial design, he is going to conduct a 2 × 4 × 2 mixed factorial design with the first two factors remaining as between-subjects and the third factor being the within-subjects factor. Which of the following will NOT change?
1) The number of possible main effects.
2) The number of participants.
3) The number of possible interactions.
4) There is not enough information to answer the question.