Using Three Statistical Analyses for Studying the Total Water Hardness of Tigris River in Mosul Town

AbstractThree statistical analyses were applied: analysis of variance and then the multistatistical comparisons represented by the test of Newman-Keul, the quality control procedure and the cluster analysis, to compare between the results of their analyses on the data represented a chemical specification by water hardness (ml/l) of Tigris river in Mosul town. The samples were taken from five sites which are: Darnajook, Shouhada'a bridge, Nineveh bridge, Danadan and Yaremjah. Some matched results were noticed between Newman-Keul test and the quality control procedure, while cluster analysis gave different results.