Journal of Earth Sciences and Geotechnical Engineering

Application of Statistical Methods to Analyze Groundwater Quality

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• Abstract

  Multivariate Hotelling T^2 and Univariate student’s t-test are applied to compare the water quality of two monitoring sites. Four water quality parameters viz. Chloride, Alkalinity, Fluoride and Total Dissolve Solids (TDS) were examined and statistical analysis showed that both monitoring sites are not identical in water quality parameters (except fluoride) and both sites are contaminated because contamination level of Fluoride and TDS in water are above the WHO and Indian standard. This paper also demonstrates that multivariate test (Hotelling T^2) is more powerful (in the sense of rejecting null hypothesis when in fact it is false) than student’s t-test. A graphical comparison of the power of both tests is also presented.