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Listed below are measured amounts of lead (in micrograms per cubic meter, or μg/m3, in the air. The Environmental Protection Agency has established an air quality standard for lead of 1.5 μg/m3. The
Listed below are measured amounts of lead (in micrograms per cubic meter, or μg/m3, in the air. The Environmental Protection Agency has established an air quality standard for lead of 1.5 μg/m3. The measurements shown below constitute a simple random sample of measurements recorded at Building 5 of the World Trade Center site on different days immediately following the destruction caused by the terrorist attacks of September 11, 2001. After the collapse of the two World Trade Center buildings, there was considerable concern about the quality of the air. Use a 0.05 significance level to test the claim that the sample is from a population with a mean greater than the EPA standard of 1.5 μg/m3. (Hint: Create a quantile plot. See Normal Quantile Plots on Blackboard.) How does the shape of the quantile plot affect your interpretation of the results?5.40 1.10 0.42 0.73 0.48 1.10
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