Given that X̄=20, σ=9 and n=81, construct the following confidence intervals: the 95% confidence interval for μ is:  a (18.04, 21.96) b (17.68, 22.47) c (18.40, 23.48) d (18.67, 22.87)

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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.