Final answer:
The statement is true because a project schedule relies on the correct task pattern. Incorrect task sequencing leads to an inaccurate project schedule, as it affects timeline, resource allocation, and critical path analysis.
Step-by-step explanation:
The statement 'A project schedule will not be accurate if the underlying task pattern is incorrect.' is true. An accurate project schedule is highly dependent on the correct identification and sequencing of tasks. If the task pattern, which involves the order and dependencies of tasks, is incorrect, the project schedule will likely be inaccurate. This is because the project schedule is built upon the framework of tasks and their relationships. If these foundational elements are flawed or misestimated, the projected timeline for completion, resource allocation, and critical path analysis will all be off, leading to potential delays and inefficiencies.