Final answer:
The statement is true; trial and error methods are a common approach in aggregate operations planning to test different scenarios and refine plans for meeting forecasted demand.
Step-by-step explanation:
The statement that trial and error methods are commonly used by aggregate operations planners in developing aggregate operations plans is true. Aggregate operations planning involves determining the best way to meet forecasted demand by adjusting production rates, labor levels, inventory levels, and other operational parameters. In practice, planners may use simulation, mathematical modeling, and trial and error to refine their plans. Trial and error can be particularly useful for exploring the potential outcomes of different planning scenarios and adjusting plans accordingly, especially when the complexity of the operation makes it difficult to predict the results analytically.