Question

n article considered various issues associated with determining endotoxin concentration. The following data on concentration (EU/mg) in settled dust for one sample of urban homes and another of arm homes was kindly supplied by the authors of the article. U: 6.0 5.0 11.0 33.0 4.0 5.0 89.0 18.0 35.0 17.0 23.0 F:4.0 14.0 11.0 9.0 9.0 8.0 4.0 20.0 5.0 8.9 21.0 9.2 3.0 2.0 0.3 (a) Determine the value of the sample standard deviation for each sample. [Hint: x 246.0 for the urban sample and 128.4 for the farm sample, and211,600 for the urban sample and 1617.94 for the farm sample.] (Round your answers to two decimal places.) urban-settlings farm-settling - Interpret these values. The endotoxin concentration in an urban home typically deviates from the mean by an amount that isSelectthe average endotoxin concentration in urban homes, and the endotoxin concentration in a farm home typically deviates from the mean by an amount that is select B the average endotoxin concentration in farm homes. Contrast variability in the two samples. The variability in endotoxin concentration is far less in urban homes than in farm homes. The variability in endotoxin concentration is similar in urban homes than in farm homes. The variability in endotoxin concentration is far greater in urban homes than in farm homes (b) Compute the fourth spread for each sample and compare. Do the fourth spreads convey the same message about variability that the standard deviations do? Explain. Yes, The fourth spreads do communicate the same message as the standard deviations did No, The fourth spreads do not communicate the same message as the standard deviations did (c) The authors of the article also provided endotoxin concentrations in dust bag dust as follows. U: 34.0 49.0 13.0 33.0 24.0 24.0 35.0 102.0 34.0 40.0 38.0 1.0 F: 2.0 66.0 6.0 17.0 35.0 11.0 17.0 13.0 5.0 27.0 23.0 28.0 10.0 13.0 0.2 Construct a comparative boxplot (as did the paper)

Answer 1

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