Posted by **Anonymous** on Monday, November 19, 2012 at 3:29am.

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 -
**MathGuru**, Monday, November 19, 2012 at 12:30pm
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.

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