Which of the following charts should be used to monitor leaks in plastic bottles?

The P chart, also known as the proportion chart, is used to monitor the proportion of defective items in a process. For leaks in plastic bottles, which are attribute data (defective or not), the P chart is appropriate as it helps track the fraction of defective units over time.

References:

Montgomery, D.C. (2009). Introduction to Statistical Quality Control. Wiley.

ASQ. (n.d.). P Chart. Retrieved from https://asq.org/quality-resources/p-chart