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

question 14

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} What is the p-value of the test? Explain how to use it for testing the hypotheses.

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Definitions:

Median

A measure of central tendency that is the middle score, or the score for which 50% of scores fall above and 50% fall below. In a skewed curve or skewed distribution of test scores, the median is generally the most accurate measure of central tendency since it is not affected by unusually high or low scores.

Standard Error of Measurement (SEM)

The margin of error in an individual's score, representing the variability in scores if the test were administered multiple times.

Test-Retest Reliability

A measure of consistency where the same test administered to the same group of individuals at two different points in time produces similar results.

Normal Distribution

A bell-shaped frequency distribution where most occurrences take place near the mean and fewer occur as the distance from the mean increases.