The third variable problem refers to
A) in a correlational study not knowing whether a relationship between two variables has actually been caused by a third variable that is related to both.
B) in an experimental design after a variable is picked to manipulate and a variable is picked to measure, not knowing what to do with a third variable unrelated to both.
C) when trying to relate three variables not knowing how to treat the third variable because our research designs allow only two to be investigated at once.
D) in an experimental design the fact that the design becomes too large to interpret once a third variable is added.
A
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