Evidence of a difference in mean ontime percentages

Reference no: EM13112481

Excel file AptOntime gives the ontime flight departure percentages for 25 major U.S. airports for scheduled airlines for September 2009 and September 2010.

a. At the .05 level of significance, is there evidence of a difference in the mean ontime percentages for the 25 airports between September 2009 and September 2010?

Reference no: EM13112481

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