11. Suppose the KittyCat brand of litter products manufactures 5 lb bags of litter. Lisa, a cat owner, believes that these bags conta less than 5 Ib of litter. She collects data on a randomly selected sample of 60 KittyCat 5 Ib litter bags and decides to use a
¡ hypothesis test to determine whether the mean weight is less than 5 Ib. Lisa believes that the weight of all such bags of litter i normally distributed, but she does not know the population standard deviation.
