A direct-mail firm tries two different versions of a mailing, one of which includes a 50-cent monetary

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A direct-mail firm tries two different versions of a mailing, one of which includes a 50-cent monetary incentive for the respondent. Responses to the mailing with the incentive were 15% higher than for a similar mailing without it. 

a. Identify the dependent and independent variables in this experiment.
b. Is a control group involved in this experiment? If so, who?

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