Course evaluation ratings for four college instructors are shown in the following table. Use a = .05 and test for a significant difference among the rating for these instructors.  What is your conclusion?   Instructor Black Jennings Swanson Wilson 88 87 88 80 80 78 76

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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.