An advantage of a within-subjects design over a matched-pairs between-subjects design is that:
A. error variance is totally eliminated in the within-subjects design.
B. measuring subject characteristics is unnecessary in a within-subjects design.
C. in the within-subjects design, it is easier to measure and take into account relevant subject characteristics.
D. it is easier to measure and take into account relevant subject characteristics, and error variance is totally eliminated.
Answer: B
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