A random sample of n1 = 10 regions in New England gave the following violent crime rates (per million population). x1:   New England Crime Rate 3.3 3.9 4.2 4.1 3.3 4.1 1.8 4.8 2.9 3.1 Another random sample of n2 = 12 regions in the Rocky Mountain states gave the following violent crime rates (per million population). x2:   Rocky Mountain Crime Rate 3.9 4.1 4.5 5.1 3.3 4.8 3.5 2.4 3.1 3.5 5.2     What is the value of the sample test statistic? (Test the difference ?1 − ?2. Round your answer to three decimal places..)

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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.