Question: Monitoring Lead in Air Listed below are measured amounts of lead (in micrograms per cubic meter, or pg/m3) in the air. The Environmental Protection Agency has es-tablished an air quality standard for lead of 1.5 itg/m3. The measurements shown be-low were recorded at Building 5 of the World Trade Center site on different days im-mediately following the destruction caused by the terrorist attacks of September 11, 2001. After the collapse of the two World Trade Center buildings, there was consider-able 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 isg/m3. Is there anything about this data set suggesting that the assumption of a normally distributed population might not be valid?

5.40 1.10 0.42 0.73 0.48 1.10

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