A doctor is examining his patient records in hopes to determine the true proportion of his patients who are overweight or obese. After examining 200 files, he finds that 55% of these patients are medically classified as being overweight or obese. Suppose that when he started his practice 5 years ago, the proportion of his patients who where overweight or obese was 64% (the current national percentage). Does this doctor have sufficient evidence to claim that the proportion of his patients with this classification has decreased over the years with alpha = 0.05?

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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.