The vehicle fleet manager for a large agricultural company realizes

The vehicle fleet manager for a large agricultural company realizes that passenger cars get higher average mileage than pickup trucks. However, he is interested in determining whether there is a difference in the variability in miles per gallon for the two types of vehicles. To test this, he has selected a random sample of trucks and a random sample of passenger cars and divided the total miles driven in the past year for each vehicle by the total gallons of gasoline used by each vehicle. The overall mpg values for the two samples are in the file called MPG. Based on the sample data, what conclusions should the manager reach about whether there is a difference in the variability in miles per gallon for the two types of vehicles? Test using an alpha level equal to 0.05.

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