Do energy bills vary dramatically depending on where you live in the United States? Suppose 25 households from four regions in the United States are sampled. The values for the average annual energy bill are shown in the accompanying table and are consistent with those found by

The Department of Energy (Money, June 2009). A portion of the ANOVA table is also shown.

a. Complete the ANOVA table. Assume energy costs are normally distributed.
b. At the 1% significance level, can we conclude that average annual energy bills vary byregion?

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West Northeast Midwest South Region Average Annua 1,491 $2,319 1,768 $1,758 Energy Bill Source of Variation SS Between Groups 7531769 37.13E-24 Within Groups df MS F p-value 349238596 Total 11024154 99