In: Statistics and Probability
The table below gives a breakdown of the root causes of a sample of 90 industrial accidents. Are there significant differences in the percentage of incidents in the four cause categories? Test using alpha =.05.
| System Cause | Number of Incidents |
| Design | 24 |
| Procedures | 30 |
| Management | 22 |
| Training | 14 |
| Total | 90 |
Give null, alternative, test statistic, decision, and conclusion.