Arsenic is a known carcinogen and poison. The standardlaboratory procedures for
Chapter 9, Problem 80(choose chapter or problem)
Arsenic is a known carcinogen and poison. The standardlaboratory procedures for measuring arsenic concentration(mg/L) in water are expensive. Consider the accompanyingsummary data and Minitab output for comparing a laboratorymethod to a new relatively quick and inexpensive fieldmethod (from the article Evaluation of a New FieldMeasurement Method for Arsenic in Drinking WaterSamples, J. of Envir. Engr., 2008: 382388).Two-Sample T-Test and CISample N Mean StDev SE Mean1 3 19.70 1.10 0.642 3 10.90 0.60 0.35Estimate for difference: 8.80095% CI for difference: (6.498, 11.102)What conclusion do you draw about the two methods, andwhy? Interpret the given confidence interval. [Note: One ofthe articles authors indicated in private communication thatthey were unsure why the two methods disagreed.]
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