Question: The average wind speed in Casper has been found to be 12.7 mph and in Tucson it has been found to be 6.2 mph. To test the relationship between the averages, a sample of 31 days was selected from each city and a summary of the data is:
Casper Tucson
Sample size 31 31
Sample mean 12.85 mph 7.9 mph
Sample standard deviation 3.3 mph 2.8 mph
Is there sufficient evidence, at Alpha = .05, to conclude that the average wind speed is greater in Casper than in Tucson?