This case study characterizes the drinking water quality by using the multivariate technique. The spatial variation of the physico-chemical and heavy metals parameters toxicity with the drinking water quality based on 28 water treatment plants in Selangor, Malaysia from 2009 to 2012 was evaluated. The objectives of this study are to analyze the physio-chemical activities and heavy metals activities in the collected drinking water samples from the treatment plants, and to detect the source of pollution for the most revealing parameters. The discriminant analysis (DA) and the principal component analysis (PCA) are the chemometric techniques used to investigate the spatial variation of the most significant physico-chemical and heavy metal parameters of the drinking water samples. The classification matrix accuracy for standard mode of DA, forward stepwise and backward stepwise for the physico-chemical and heavy metal parameters are excellent. PCA highlighted 13 significant parameters out of 18 physico-chemical water quality parameters and 14 significant parameters out of 16 heavy metal parameters. PCA was carried out to identify the origin and source of pollution of each water quality parameters. For that reason, this study proves that chemometric method is the principle way to explain the characteristic of the drinking water quality.

This study is carried out with the purpose of gaining more in-depth information in regard to the reading habits of 210 English Language (EL) teachers in the district of Klang, Selangor. A convenient sampling method is used to choose the respondents while data are gathered with a survey questionnaire. The first aim of this study is to study the types of materials read by ESL teachers. Secondly, it aims to identify the rate of extensive reading among these teachers. The results show that ESL teachers read mostly light reading materials online and shun heavy materials. The researcher also discovered that the rates of extensive reading among ESL teachers are average to high. Therefore, the Ministry of Education could implement nationwide reading programs and teachers should take the initiative to read more.