Course evaluation ratings for four college instructors are shown in the following table. Use alpha= .05 and test for a significant difference among the rating for these instructors. What is your conclusion? MAKE SURE TO SPECIFICALLY NOTE THE CRITICAL VALUE. Black Jennings Swanson Wilson 88 87 88 80 80 78 76 85 79 82 68 56 68 85 82 71 96 99 85 89 69 99 82 87   85 84     94 83       81

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A: Introduction - Mean or average = Sum of observations total number of observations

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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.