Question: Contamination of New Jersey wells. 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). The data are listed in the accompanying table and saved in the NJGAS file.

150 367 38 12 11 134

12 251 63 8 13 107

1. Give a point estimate for the true mean MTBE level for all well sites located near the New Jersey gasoline service station.
2. Calculate and interpret a 99% confidence interval for
3. What assumptions are required for the interval, part b,

to be valid? Are these assumptions reasonably satisfied?

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