Using the data in Problem 8, test whether there is a difference in endotoxin levels between children living within 5 miles of an operating farm as compared to those living between 5 miles and 24.9 miles. Run the appropriate test at a 5% level of significance.

Problem 8

An investigator wants to test whether 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.

Run the appropriate test at a 5% level of significance.