The average mpg usage for a 2017 Toyota Prius for a sample of 10 tanks of gas was 43.4 with a standard deviation of 2.4. For a 2017 Ford Fusion, the average mpg usage for a sample of 10 tanks of gas was 40.8 with a standard deviation of 2.8 Assuming equal variances, at a = .01, is the true mean mpg lower for the Ford Fusion? (a-2) Calculate the teale. (Round your answer to 4 decimal places.) (a-3) Based on the teale determined, choose the correct decision (b) Calculate the p-value using Excel. (Round your answer to 4 decimal places.)