1. In studying the effectiveness of monetary rewards on seat belt usage, a firm has been giving out lottery tickets to employees wearing their belts when entering the com- pany parking area. At the end of each week, the holder of the winning ticket gets a free dinner at a local restaurant.
Before the experiment, only 36% of employees wore seat belts. After 1 month of the lottery, the usage rate is up to 57%.
a. Identify the dependent and independent variables in this experiment.
b. Is a control group involved in this experiment? If so, who?
2. A direct-mail firm tries two different versions of a mailing, one of which includes a 50-cent monetary incen- tive 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?