The primary difference between the Solomon four-group design and the two-factor experimental design is that ONLY the two-factor experimental design:
A)involves four groups of participants.
B)requires random assignment of participants to groups.
C)has a measurement before initial treatment.
D)includes two different treatments.

Question

Quizplus · Accepted Answer

The Solomon four-group design includes four groups of participants, requires random assignment of participants, and includes a measurement before initial treatment. However, it only includes one treatment, while the two-factor experimental design includes two different treatments in addition to all the other features mentioned.

The Primary Difference Between the Solomon Four-Group Design and the Two-Factor