Worker Safety An OSHA Agent Wanted to Determine If Efforts to Promote

question 37

Essay

Worker Safety
An OSHA agent wanted to determine if efforts to promote safety have been successful.By checking the records of 250 workers,he found that 30 of them suffered either minor or major injuries that year.A random sample of 400 workers last year revealed that 80 suffered some form of injury. ​ ​
-{Worker Safety Narrative} Can the statistician infer at the 5% significance level that efforts to promote safety have been successful?