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Preliminary data show a pile of solid waste from a solvent recovery facility has trichloroethene concentration...

Preliminary data show a pile of solid waste from a solvent recovery facility has trichloroethene concentration of 7.0 mg/kg (average of 4 samples) and standard deviation of 1.2 mg/kg. The regulatory soil screening level for trichloroethene is 6 mg/kg. The required minimum number of sample for an estimation at the 80% confidence is _____.

math   Statistics-And-Probability   
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