A study is designed to investigate whether there is a difference in response to various
treatments in patients with rheumatoid arthritis. The outcome is patient’s self-reported
effect of treatment. The data are shown below. Is there a statistically significant
difference in the proportions of patients who show improvement between treatments 1
and 2. Apply the test at a 5% level of significance.
1. Critical value: (2 points)
2. Computed statistic: (2 points)
3. Based on comparing the computed statistics to the critical value which of the
following is (are) true? (6 points)
a. There is significant evidence, alpha=0.05, to show that there is a difference in
the proportions of patients who show improvement between treatments 1 and 2.
b. There is not significant evidence, alpha=0.05, to show that there is a difference in
the proportions of patients who show improvement between treatments 1 and 2.
c. There is significant evidence, alpha=0.05, to show that there is a no difference in
the proportions of patients who show improvement between treatments 1 and 2.
d. a and c.
data on document…4th page
