An automobile company is looking for fuel additives that might increase gas mileage. Without additives, their cars are known to average 25 mpg (miles per gallons) on a road trip from London to Edinburgh. The company now asks whether a particular new additive increases this value. In a study, thirty cars are sent on a road trip from London to Edinburgh. Suppose it turns out that the thirty cars averaged 25.5 mpg with the additive.

Can we conclude from this result that the additive is effective?

Please select a right alternative hypothesis

a.

new old

b.

new>old

c.

new