Fuel efficiency of manual and automatic cars, Part II: The table provides summary statistics on highway fuel economy of cars manufactured in 2012. Use these statistics to calculate a 98% confidence interval for the difference between average highway mileage of automatic and manual cars, and interpret this interval in the context of the data. Use automatic as Group A and manual as Group B. Round your answers to 3 decimal places. 0 Mean SD n ✓ 35- O 25- 15- Hwy MPG, Automatic Hwy MPG, Manual 27.88 5.01 26 automatic 22.92 5.29 26 lower bound: 1.53 x mpg upper bound: 8.39 x mpg Interpret your confidence interval in the context of the problem: O 98% of manual and automatic cars will have a difference in highway mileage that falls within our confidence interval Hwy MPG manual We are 98% confident that the true difference in average highway mileage of manual and automatic cars is contained within our confidence interval Does your confidence interval provide significant evidence for a difference in the highway fuel efficiency of automatic versus manual cars? Explain. O We are 98% confident that our confidence interval contains the difference in average highway mileage of the cars in our sample is contained within our confidence interval Yes, since 0 is not contained within our confidence interval O No, since negative highway mileage doesn't make sense O Yes, since highway mileage cannot be negative O No, since 0 is not contained within our confidence interval

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