A researcher plans to conduct an experiment to test whether a cup of hot milk at night helps people fall asleep faster than usual. In this study, the independent variable is:

Question

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The independent variable is the variable that the researcher manipulates or changes in order to see the effect it has on the dependent variable. In this case, the independent variable is the consumption of hot milk at bedtime, as this is what the researcher is manipulating to see its effect on the dependent variable of how long it takes participants to fall asleep.

A Researcher Plans to Conduct an Experiment to Test Whether