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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Zinfandel is a popular red wine varietal produced almost
exclusively in California. It is rather controversial
among wine connoisseurs because its alcohol content
varies 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 alcohol
content (%):
14.8 14.5 16.1 14.2 15.9
13.7 16.2 14.6 13.8 15.0
a. Calculate and interpret several measures of center.
b. Calculate the sample variance using the defining
formula.
c. Calculate the sample variance using the shortcut
formula after subtracting 13 from each observation.

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