A study is designed to investigate whether there is a difference in response to various treatments in patients with Rheumatoid arthritis. The outcome is the patient’s self-reported effect of treatment. The data are shown below.
Symptoms
Worsened
No Effect
Symptoms Improved
Total
Treatment 1
22
14
50
Treatment 2
15
21
Treatment 3
9
12
29
Is there a significant difference in effect of treatment? Run the test at a 5% level of significance.
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