You are the consumer affairs reporter for a daily newspaper. Part of your job is to investigate the claims of manufacturers, and you are particularly suspicious of a new economy car that the...

You are the consumer affairs reporter for a daily newspaper. Part of your job is to investigate the claims of manufacturers, and you are particularly suspicious of a new economy car that the manufacturer claims will get 3.0 L/100 km. After checking the mileage figures for a random sample of 120 owners of this car, you find an average L/100 km of 3.1 with a standard deviation of 3.7. At the 99% level, do your results tend to confirm or refute the manufacturer’s claims?