18. At the General Mills plant in Edina, Minnesota, 24 ounce boxes of Honey Nut Cheerios are
filled by an automatic machine. This machine isn’t perfect: it fills the boxes according to a
normal distribution with mean = 24 ounces and standard deviation of 0.2 ounces. Sometimes the
machine goes out of balance, and the mean amount of cereal put in the boxes falls to 23.5
ounces. The plant mangers want to stop the production line and reset the machine whenever this
happens, but it is very expensive and time-consuming to weigh every box of cereal, so they
decide to sample 16 boxes of c

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