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The 2004 Ford Expedition has a standard deviation for mpg of 0.64. In a sample of 40 tanks of gas, the average mpg usage was
The 2004 Ford Expedition has a standard deviation for mpg of 0.64. In a sample of 40 tanks of gas, the average mpg usage was 17.0. The 2004 ford explorer has a Standard deviation for mpg of 0.52. In A sample of 50 tanks of gas, for the explorer, the average mpg usage was 18.5. At = . significance level, is the true mean mpg lower for the Ford Expedition?
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