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What defines a study as experimental or correlational is strictly how it is conducted, not the variables studied or the graphs used. For instance, in a study on daily to-do lists and stress, the design is an experiment if the researcher randomly assigned participants to make lists (manipulation), allowing for the conclusion that making lists reduces stress. However, if the researcher merely asked pre-existing groups if they make to-do lists, it is a correlational study. In the correlational case, one can only conclude the variables are statistically related, as stress might prevent planning (directionality problem) or conscientiousness might affect both (third-variable problem).

Example of Distinguishing Correlational and Experimental Research

In a study examining the relationship between daily to-do lists and stress, what specific researcher action defines the design as an experiment rather than a correlational study?

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