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Question 1 Two rheumatologists attempted to classify 200 potential osteoarthritis patients based on their X- rays as normal" and "abnormal independently. The results of their classification are provided in the following table: Rheumatologist 2 Abnormal Normal Rheumatologist 1 Abnormal Normal 80 40 20 60 100 100 120 80 200 1.1 What is the overall observed agreement between the rheumatologists? 1.2 What is the agreement after removing the X-rays that both classified as normal? 1.3 What is the expected agreement by chance? 1.4 What is the Kappa value? 1.5 How do you think the agreement is between the two rheumatologists