Question: A study of pollutants showed that certain industrial emissions should
A study of pollutants showed that certain industrial emissions should not exceed 2.5 parts per million. You believe a particular company may be exceeding this average. To test this supposition, you randomly take a sample of nine air tests. The sample average is 3.4 parts per million, with a sample standard deviation of 0.6. Does this result provide enough evidence for you to conclude that the company is exceeding the safe limit? Use α = .01. Assume emissions are normally distributed.
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