In his experiment, Pennebaker wanted to find out if writing about emotions would cause improvements in a person's physical health. Writing about emotions would be the:

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In Pennebaker's experiment, writing about emotions is the independent variable because it is the condition manipulated by the researcher to observe its effect on the dependent variable, which in this case would be improvements in a person's physical health.

In His Experiment, Pennebaker Wanted to Find Out If Writing