Refer to the Environmental Science & Technology (Jan. 2005) study of contaminated well sites located near a New Jersey gasoline service station, Exercise 7.29. The data (parts per billion) on the level of methyl tert-butyl ether (MTBE) at 12 sampled sites are reproduced in the table. Use the bootstrap procedure to estimate the mean MTBE level for all well sites located near the New Jersey gasoline service station with a 99% confidence interval. Compare the bootstrap interval with the interval you obtained in Exercise 7.29, part b.   

Data from Exercise 7.29

Methyl t-butyl ether (MTBE) is an organic water contaminant that often results from gasoline spills. The level of MTBE (in parts per billion) was measured for a sample of 12 well sites located near a gasoline service station in New Jersey. (Environmental Science & Technology, Jan. 2005.)

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NJGAS 150 367 38 12 11 134 12 251 63 8 13 107