Bastien, Inc. has been manufacturing small automobiles that have averaged 55 miles per gallon of gasoline in highway driving. The company has developed a more efficient engine for its small cars and now advertises that its new small cars average more than 55 miles per gallon in highway driving. An independent testing service road-tested 45 of the automobiles. The sample showed an average of 56.2 miles per gallon with a standard deviation of 5 miles per gallon. With a 0.05 level of significance, do you accept or reject the manufacturer's claim.