In the EOQ model, when the demand is uncertain, why do you need safety stock? To satisfy the service level To ensure that you always have inventory in hand To ensure there are zero stockouts QUESTION 13 In the EOQ model, if the demand variability increases, the safety stock Does not change Increases Decreases QUESTION 14 In the EOQ model, if the lead time increases, the safety stock Decreases Increases Does not change QUESTION 15 In the EOQ model, if the required customer service level decreases, the safety stock Decreases Does not change Increases