# statistics

posted by .

2. The Occupational Safety and Health Administration (OSHA) estimates that roughly 30% of all worker compensation claims stem from back injuries. This statement was made many years ago and you want to know if this has changed in recent years. Suppose you take a random sample of 200 claims and find that 45 of them relate to back injuries.

• statistics -

You can try a proportional one-sample z-test for this one since this problem is using proportions.

Using a formula for a proportional one-sample z-test with your data included, we have:
z = .225 - .30 -->test value (45/200) is .225) minus population value (.30) divided by
√[(.30)(.70)/200] --> .70 represents 1-.30 and 200 is sample size.

Finish the calculation. I'll let you take it from here.

## Similar Questions

1. ### Safety

who is the father of occupational medicine in U.S. Dr. Alice Hamilton could be considered the "mother" of occupational medicine in the U.S. http://www.answers.com/topic/advisory-committee-on-construction-safety-and-health-accsh
2. ### Occupational Safety

Compare countries Thailand and South Africa for Occupational Health and Safety statistics..how do they compare?
3. ### Thailand & South Africa

I need to know the occupational health and safety statistics for Thailand and South Africa. and how they compare?
4. ### Safety

do other countries have programs similar to worker's compensation in states such as West Virginia?
5. ### Algebra

The Occupational Safety and health Administration (OSHA) estblished permissible sound exposures in the work-place. This is modeled by the equation: S=-2.817H + 108.9 Use the formula for the problem: S=maximun permissible sound level …
6. ### Algebra

The Occupational Safety and health Administration (OSHA) estblished permissible sound exposures in the work-place. This is modeled by the equation: S=-2.817H + 108.9 Use the formula for the problem: S=maximun permissible sound level …
7. ### Workplace Hazards and Safety

Describe and explain 5 rights and/or responsibilities of the worker with regards to safety in the workplace. This is the information I have: Worker's responsibilites: -Cooperate with the joint committee or worker health and safety …
8. ### English

Describe and explain 5 rights and/or responsibilities of the worker with regards to safety in the workplace. This is the information I have: Worker's responsibilites: -Cooperate with the joint committee or worker health and safety …
9. ### statistics

Wages and salaries make up only part of a total compensation. Other parts include paid leave, health insurance, and many others. In 2007, wages and salaries among manufacturers in the United States made up an average of 65.8% of total …