A production line operates with a mean filling weight of 16 ounces per container. Overfilling or underfilling presents a serious problem and when detected requires the operator to shut down the production line to adjust the filling mechanism. From past data, a population standard deviation o = 8 ounces is assumed. A quality control inspector selects a sample of 100 items every hour and at that time makes the decision of whether to shut down the line for readjustment. The level of significance is a 0.05