Lisa Grattan, a financial analyst for a small investment firm, collects annual stock return data for 10 firms in the energy industry, 13 firms in the retail industry, and 16 firms in the utilities industry. A portion of the data is shown in the accompanying table; the entire data set, labeled Industry_Returns, can be found on the text website.

In a report, use the sample information to:

1. Determine whether significant differences exist in the annual returns for the three industries at the 5% significance level. Assume that returns are normally distributed.

2. Interpret your results.

Transcribed Image Text:

Energy 12.5 8.2 Retail 6.6 7.4 Utilities 3.5 6.4 6.9 1 7.9 4.3