A random sample of n = 25 individuals is selected from a population with µ = 20, and a treatment is administered to each individual in the sample. After the treatment, the sample mean is found to be M = 22.2, with SS =384. Based on the sample data, does the treatment have a significant effect? Use a two-tailed test with α = .05. Write the hypothesis test out on a homework worksheet so that you can check your work. Then answer the question below: What is the critical value?

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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.