A doctor randomly divides patients experiencing social anxiety into three groups, each of which receives a different treatment believed to reduce social anxiety. A researcher who knows nothing about the study measures each patient's social anxiety using a standard questionnaire before and after treatment. Group 3 is the only group in which post treatment scores were significantly lower (less social anxiety) than pre- treatment scores. a. Is this an experiment? Why or why not? b. Identify the independent and dependent variables.

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