Using multiple levels of an independent variable in single-subject designs presents certain problems because:
A. only one or a few subjects are tested, and completely counterbalancing the order of treatments across subjects is not usually possible.
B. there are no statistical tests that can be applied to the resulting data.
C. subjects may get tired too quickly to allow for complete replication.
D. All of the answers are correct.
Answer: A
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Fill in the blank(s) with correct word
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a. 1–2 b. 2–5 c. 5–10 d. 10–12
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