Final answer:
When a teacher provides a comment like 'good level swing,' it is considered positive reinforcement, which aims to reinforce the desired behavior of a good swing.
Step-by-step explanation:
If a teacher says "Daryl, good level swing," when teaching children to strike a ball with a bat, this would be coded as positive reinforcement. This type of feedback is used to encourage the behavior that led to the positive result, which in this case is performing a good level swing. Positive reinforcement helps to strengthen the student's confidence and likely increases the chances of the behavior being repeated in the future.