Final answer:
For a patient who has hemiparesis on the right side due to a stroke, the wheelchair should be positioned at the head of the bed on the patient's left side to provide optimal support for transfer.
Step-by-step explanation:
When transferring a patient with hemiparesis due to a stroke from bed to a wheelchair, it is important to position the wheelchair on the patient's stronger side to provide support for the transfer. Therefore, since the patient has weakness on the right side, the wheelchair should be placed at the head of the bed on the patient's left side. This positioning makes it easier for the patient to use their stronger side for support, and it helps in ensuring safety during the transfer process.