statement of cost of goods sold can easily be determined from the The account. The cumulative average-time learning curve model and the simple average unit-time learning curve model will always give 2. (True- False) the same results in determining labor time in hours. The industrial engineering method of estimating cost mathematical method in deriving the fixed and variable cost components. . (True -False) functions is based on a formal The cumul doubled ative average-time learning model can only be used when the units produced are 4. (True- False) 5. (True False) 6. (True False) 7. (True- False) The learning curve model is based on linear relationships. All accumulated costs are classified as indirect costs. The least important issue in estimating a cost function is determining whether a cause-effect relationship exists between the level of an activity and the costs related to that level of activity 8. A variable cost function is best depicted by the equation