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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City Data Birmingham AL 18 23 Memphis TN Little Rock AR 18 Jackson MS an17 Jan 18 Jan 31 Feb 1 Feb 6 Feb 14 Feb 17 Feb 20 Feb 29 30 21 35 24 29 27 28 28 31 31 31 31 35 42 28 35 42 28 34 21 20