An experiment reported in popular science compared fuel economies for two types of similarly equipped diesel mini trucks. let us suppose that 11 volkswagen and 9 toyota trucks were tested in 90- kilometers per-hour steady-paced trials. if the 11 volkswagen trucks averaged 16 kilometers per liter with a standard deviation of 1.0 kilometer per liter and the 9 toyota trucks averaged 11 kilometers per liter with a standard deviation of 0.8 kilometer per liter. assume that the distances per liter for the truck models are approximately normally distributed with equal variances. construct a 98% confidence interval for /, where and are, respectively, the standard deviations for the distances traveled per liter of fuel by the volkswagen and toyota mini trucks.