Final answer:
The purpose of comparing the performance of line workers who attended a training program with a control group who received on-the-job (OTJ) training is to evaluate the training program on the criterion of behavior.
Step-by-step explanation:
The purpose of comparing the performance of line workers who attended a training program with a control group who received on-the-job (OTJ) training is to evaluate the training program on the criterion of behavior. Behavior measurements of job activities by supervisors can help determine the effectiveness of the training program in improving the workers' performance and job behavior.