An experimenter claims that going to church increases marital happiness. In order to make this claim, the experimenter must have used what type of research?

Question

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To make a claim about causality (i.e., that going to church increases marital happiness), an experimental study is necessary because it involves manipulating one variable (in this case, church attendance) to see its effect on another variable (marital happiness), allowing the researcher to establish a cause-and-effect relationship.

An Experimenter Claims That Going to Church Increases Marital Happiness