11.14 Engineers are testing company fleet vehicle fuel economy (miles per gallon) performance by using different types of fuel. One vehicle of each size is tested. Does this sample prove that there is a significant difference in treatment means? MPG2 87 Octane 89 Octane 91 Octane Ethanol 5% Ethanol 10% Compact 27.2 30.0 30.3 26.8 25.8 Mid-Size 23.0 25.6 28.6 26.6 23.3 Full-Size 21.4 22.5 22.2 18.9 20.8 SUV 18.7 24.1 22.1 18.7 17.4
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