50. Sustainable stocks. The earnings per share ratio

(EPS) is one of several important indicators of a company’s profitability. There are several categories of “sustainable”

stocks including natural foods/health and green energy/bio fuels. Below are earnings per share for a sample of stocks from both of these categories (Yahoo Financial, April 6, 2008). Is there a significant difference in earnings per share values for these two groups of sustainable stocks?

a) Test appropriate hypotheses and state your conclusion.

b) Based upon the boxplots of the two distributions shown below, what might you suspect about your test?
Explain.

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Group Count Mean Median StDev Foods/Health 15 Energy/Fuel 0.862 1.140 0.745 16 -0.320 -0.545 0.918