Exposure to microbial products, especially endotoxin, mayhave an impact on vulnerability

Chapter 1, Problem 34

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Exposure to microbial products, especially endotoxin, mayhave an impact on vulnerability to allergic diseases. Thearticle Dust Sampling Methods for EndotoxinAnEssential, But Underestimated Issue (Indoor Air, 2006:2027) considered various issues associated with determiningendotoxin concentration. The following data on concentration(EU/mg) in settled dust for one sample of urbanhomes and another of farm homes was kindly supplied bythe authors of the cited article.U: 6.0 5.0 11.0 33.0 4.0 5.0 80.0 18.0 35.0 17.0 23.0F: 4.0 14.0 11.0 9.0 9.0 8.0 4.0 20.0 5.0 8.9 21.09.2 3.0 2.0 0.3a. Determine the sample mean for each sample. How dothey compare?b. Determine the sample median for each sample. How dothey compare? Why is the median for the urban sampleso different from the mean for that sample?c. Calculate the trimmed mean for each sample by deletingthe smallest and largest observation. What are the correspondingtrimming percentages? How do the values ofthese trimmed means compare to the correspondingmeans and medians?

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