question archive The primary difference between the Solomon four-group design and the two-factor experimental design is that ONLY the two-factor experimental design: 1
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The primary difference between the Solomon four-group design and the two-factor experimental design is that ONLY the two-factor experimental design:
1. involves four groups of participants.
2. requires random assignment of participants to groups.
3. has a measurement before initial treatment.
4. includes two different treatments.
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