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Indicate whether each of the following studies is an experiment or an observational study. If it...

Indicate whether each of the following studies is an experiment or an observational study. If it is an experiment, identify the independent variable and note any possible confounding variables.

Investigators found that four year-old children who delayed eating one marshmal-low in order to eat two marshmallows later, scored higher than non-delayers on the Scholastic Aptitude Test (SAT) taken over a decade later.

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