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    Contamination of New Jersey Wells

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    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

    Calculate and interpret a 99% confidence interval for the mean.

    Here is the answer that I came up with. Can you check it for accuracy and explain the interpretation of this problem.

    Confidence interval - mean

    99% confidence level
    97.2 mean
    10.67 std. dev.
    12 n
    2.576 z
    7.934 half-width
    105.134 upper confidence limit
    89.266 lower confidence limit

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    Solution Preview

    MTBE Level
    150
    367
    38
    12
    11
    134
    12
    251
    63
    8
    13
    107

    Mean 97.16666667
    Standard Deviation ...

    Solution Summary

    Contamination of New Jersey Wells is examined. The environmental science and technology is analyzed.

    $2.19

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