15. Fixed costs that can be changed relatively easily are called Discretionary Fixed Costs. True False 16. Typically costs in the real world are semi-variable costs. True False 17. Mixed costs are costs that have both fixed and variable components. True False 18. In this semester, you were diligent in completing your assignments for a better grade. In this example, 'Assignments' is an dependent variable. True False 19. In Business, Planning refers to a management activity that involves the detailed formulation of action to achieve a goal. True False