Final answer:
To measure the effectiveness of feedback from the audience to the communicator, analyze the impact on the rhetorical choices and the changes made as a result.
Step-by-step explanation:
To measure the effectiveness of feedback from the audience to the communicator, you can evaluate the impact it has on the overall understanding and reception of the message.
One way to do this is through analyzing the changes made to the communicator's rhetorical choices based on the feedback received.
For example, if the audience provides feedback on the clarity of the communicator's language and the communicator then adjusts their wording to improve understanding, it can be considered an effective feedback loop.