Posted by **Kim** on Sunday, September 19, 2010 at 8:27pm.

The average mpg usage for a 2004 Ford Expedition 2WD for a sample of 10 tanks of gas was 17.0with a standard deviation of 0.8. For a Ford Explorer 2WD, the average mpg usage for a sample of 10 tanks of gas was 18.5 with a standard deviation of 1.0. (a) Assuming equal variances, at รก = .01, is the true mean mpg lower for the Ford Expedition? (b) Calculate the p-value using Excel.

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