A researcher conducts a 3 × 2 factorial design with 15 participants observed in each group. How many participants are needed to conduct this experiment if he or she conducts each of the following designs?
1. Between-subjects factorial design
2. Within-subjects factorial design
3. A mixed factorial design in which the first factor is a within-subjects factor
4. A mixed factorial design in which the second factor is a within-subjects factor
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