The average wind speed in Casper Wyoming has been found to 12.7 miles per hour and in Phoenix Arizona it is 6.2 mph. To test the relationship between the averages, the average wind speed has calculated for a sample of 31 days for each city. The results are reported below. Is there sufficient evidence at alpha = 0.05 to conclude that the average wind speed is greater in Casper or Phoenix ?  Sample size  Casper  31 Phoneix  31 Sample mean  12.85mph 7.9mph Sample standard deviation  3.3mph 2.8mph

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