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

question 66

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} Estimate with 95% confidence the difference in population proportions.

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Definitions:

Null Hypothesis

A default hypothesis that there is no significant difference or effect, typically set against the alternative hypothesis in statistical testing.

Alpha

A coefficient used in statistics that represents the level of significance, often denoted as the probability of rejecting a true null hypothesis.

T-statistic

A type of statistic used in hypothesis testing, calculated to compare the mean of a sample to the known mean of the population.

Null Hypothesis

The hypothesis that predicts no relationship or effect between the independent and dependent variables being studied.