The table below (saved in the MSFAIL file) gives a breakdown of the root causes of a sample of 83 incidents ...

9.13
Management system failures. 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 2.6 (p. 39).The table
below (saved in the MSFAIL file) 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 a = .05.
Management System Cause Number of Incidents
Engineering & Design 27
Procedures & Practices 24
Management & Oversight 22
Training & Communication 10
Total 83