A researcher evaluated the effectiveness of relaxation training in reducing anxiety. One sample of anxiety ridden people received relaxation training, while a second sample did not. Then anxiety scores were measured for all subjects, using a standardized test. Us the information summarized in the following table to complete this item.  The Effect of Relaxation Training on Anxiety Scores Group  Mean Anxiety Score  SE Control group  36  12 Relaxation   training 18  10 What is the independent variable (IV)?  How many levels do we have for the IV?  What is the level of measurement for the IV?

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