# Biostatistics homework

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Question description

1.  An investigator wants to test if there is a difference in endotoxin levels in children who are exposed to endotoxin as a function of their proximity to operating farms.  The following are endotoxin levels in units per milligram of dust sampled from children’s mattresses, organized by children’s proximity to farms.

Within 5 Miles  54  62  78  90  70

5-24.9 Miles  28  42  39  81  65

25-49.9 Miles  37  29  30  50  53

50 Miles or More  36  19  22  28  27

 Total Sample (Ordered Smallest to Largest) < 5 Miles 5-24.9 Miles 25-49.9 Miles 50+ Miles < 5 Miles 5-24.9 Miles 25-49.9 Miles 50+ Miles

Apply the Kruskal Wallis test at a 5% level of significance.

Alpha= ________

df= ________

Critical value= ________

H= ________

Based on comparing H to the critical value to the Critical value which of the following is (are) true?

A.  There is significant evidence at alpha=0.05 t o show that the populations of endotoxin levels in children living varying distances from operating farms are not equal.

B.  There is not significant evidence at alpha =0.05 to show that the populations of endotoxin levels in children living varying distances from operating farms are not equal.

C.  There are not enough data points to reach a conclusion.

D.  The tied value makes the analysis suspect.

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