The U S Environmental Protection Agency EPA monitors levels of pollutants
The U.S. Environmental Protection Agency (EPA) monitors levels of pollutants in the air for cities across the country. Ozone pollution levels are measured using a 500-point scale; lower scores indicate little health risk, and higher scores indicate greater health risk. The following data show the peak levels of ozone pollution in four cities (Birmingham, Alabama; Memphis, Tennessee; Little Rock, Arkansas; and Jackson, Mississippi) for 10 dates in 2012 (U.S. EPA website, March 20, 2012).

Use α = .05 to test for any significant difference in the mean peak ozone levels among the fourcities.
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