Question: 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

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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