The most accurate and time-consuming estimating method: Group of answer choices uses the statistical relationship that exists between historical data and a particular delineated list of other variables. is to identify the cost of each item in each activity of the schedule, including labor and materials. uses the actual costs from previous projects as a basis for estimating the costs for the current project. involves scaling estimates which are based on other project estimates upward or downward. involves sorting detailed cost estimates by activity and then subtotaling activities to determine the cost for each activity