Suppose that your agency has been evaluating an intervention using a posttest-only control group design. There were 95 people in the treatment group and 111 in the control group. The outcome variable takes the following three ordinal values: normal, overweight, and obese. What statistical test would be most appropriate for testing the null hypothesis of no intervention effect?

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.