The major difference between the hypothesis-testing procedures in factorial versus single-variable designs is that
A) single-variable designs, although less complicated in terms of design, are more difficult to interpret.
B) there are more dependent variables in the factorial design.
C) the reasoning is very different in each type of design.
D) there is more chance for confounding to occur in factorial designs.
Answer: D) there is more chance for confounding to occur in factorial designs.
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