Final answer:
The matrix is used in appointment scheduling to show times not available for scheduling as they are pre-allocated, helping to avoid double bookings and manage appointments efficiently.
Step-by-step explanation:
The answer to the question: Which of the following contains the times already allotted which are therefore not available for scheduling patients? is b. Matrix. The matrix in appointment scheduling is a grid or template that displays the available appointment times and the ones that are not available for scheduling. It is used to block out times when the healthcare professional is not available to see patients, either due to other commitments, personal time, or because those times have been pre-scheduled with other patients. By maintaining an accurate matrix, the administrative staff can efficiently manage the scheduling of appointments, ensuring that no time slots are double-booked and that patients are seen in a timely manner.