The document summarizes a workshop about factors that affect water quality, including climate, rainfall, soil, forest coverage, agriculture, urban areas, and waste management. It describes how to properly take a water sample, transporting it to a lab in a sterilized bottle and refrigerating it. Finally, it discusses the workshop covering various water testing techniques, measurement scales, and using statistics and graphs in Excel to analyze water sample data.

1. José Gerardo Cruz Rivera804-10-1716<br />Quality of water<br /> The workshop given last February 11, 2011 was about how water is affected by environmental variables such as climate, rainfall, soil, and forest. We used the term “total coliform” (which are fecal bacteria and bacteria in the environment) to explain different water pollutant. Other causes that affect the quality of water are agriculture, urban areas, and waste management all caused mostly by humans. Moreover, Dr. Javier Arce explained how to take a water sample to be later analyzed. We need to carry out the following procedure: let the water run for 2 or 3 minutes, take the sample in a sterilizer bottle free of clorox, bring it to a laboratory and put it in a refrigerator. After transporting it to the laboratory, a series of processes need to be done. <br />The first step is to use the Multiple Tube Fermentation Technique whereby you count the number of colonies on the \"
Heterotrophic Plate” or defined substrate technology. Later, he explained central tendency and dispersion measures, and we began to perform these descriptive statistics. He also explained the nominal (qualitative), ordinal (qualitative), interval (numeric) and rational (number) measurement scales. Finally, through graphs and the Excel program, we learned to do averages and general statistical measures.<br />