______ designs are used to test hypotheses or measure the reaction of one variable to a change in another variable.

______ designs are used to test hypotheses or measure the reaction of one variable to a change in another variable.

______ designs are used to test hypotheses or measure the reaction of one variable to a change in another variable.



a. More informal
b. More formal
c. More expensive
d. Less expensive


Answer: b. More formal


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