Zinfandel is a popular red wine varietal produced almostexclusively in California. It is rather controversialamong wine connoisseurs because its alcohol contentvaries quite substantially from one producer to another.In May 2013, the author went to the website klwines.com, randomly selected 10 zinfandels from among the 325 available, and obtained the following values of alcoholcontent (%):14.8 14.5 16.1 14.2 15.913.7 16.2 14.6 13.8 15.0a. Calculate and interpret several measures of center.b. Calculate the sample variance using the definingformula.c. Calculate the sample variance using the shortcutformula after subtracting 13 from each observation.

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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.