6. a. Below are the scores on a pain scale (a higher score means a higher level of pain) among patients who were treated with pain drugs depending on their stomach condition. Describe the interaction effect. No Drug Drug Empty Stomach Mean = 10 Mean = 20 Overall mean = 15 Full Stomach Mean = 20 Mean = 10 Overall mean = 15 Overall mean = 15 Overall mean = 15 b. Below are the scores on a pain scale with different types of patients. Describe the interaction effect. No Drug Drug Empty Stomach Mean = 30 Mean = 40 Overall mean = 35 Full Stomach Mean = 30 Mean = 20 Overall mean = 25 Overall mean = 30 Overall mean = 30