The table below gives a breakdown of the root causes of a sample of 83 incidents. Are there significant differences in the percentage of incidents in the four cause categories? Test using α = .05.

For Information: Refer to the Process Safety Progress (Dec. 2004) and U.S. Chemical Safety and Hazard Investigation Board study of industrial accidents caused by management system failures, Exercise 2.146.

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Management System Cause Number of Incidents 27 24 Engineering& Design Procedures & Practices Management & Oversight Training& Communication 10 Total 83