A York Occupational Safety and Health Administrator launched a Health and Safety Program and wanted to determine if efforts to promote safety have been successful at the York Campus. By checking the records of 250 employees. He found that 65 of them suffered either minor or major injuries this year. He also took a random sample of 125 emplovees and revealed that 25 suffered some form of injury last year.

Can the Administrator infer at the 2.5% significance level that the injuries have decreased by more than 10% when comparing this year's results to last year's results?

Estimate with 95% confidence the proportion of employees who suffered either minor or major injuries this year.

Here are the number of injuries reported at York in four different departments: Construction 35%, Transportation 25%, Parking 30%, and Food Services 10%. Another York Occupational Safety and Health Administrator wanted to determine if efforts to promote safety have been successful at the York Campuses. A randm sample of 150 workers were taken. He found that 55 of them suffered injuries in Construction, 25 of them suffered injuries in Transportation, 40 of them suffered injuries in Parking, and 30 of them suffered injuries in Food Services. Can the Administrator infer at the 5% significance level that the proportion has changed from the efforts to promote safety that has occurred on campus?