question 2. consider a shipment of 10 bags of cement, which are supposed to weigh 200 lb each. the sample average weight of the 10 bags is 198.5lb with a sample standard deviation 1.65lb. (a) suppose that the 10 weighs can be viewed as a realization of a random sample from a normal distribution with unknown parameters. construct a two-sided 95% ci for the expected weight of a bag. (b) based on these data, how many bags would you need to sample to make a two-sided 90% ci that is 0.45lb wide? (c) suppose that you actually do obtain the required number of bags calculated in part (b) and construct a new ci. is it guaranteed to be at most 0.45lb wide?