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Statistics are used everywhere. Evaluating the level of public support for Iraqi-Kurdistan’s independence referendum by doing survey, weather forecasts estimate the probability that it will rain tomorrow based on a variety of atmospheric measurements, measuring unemployment rate in Iraq during 2017, measuring total government expenditure last year, choosing several countries to know how tall are people or how fat are people from different countries. For making an educated decision in all previous examples we need statistics. Statistics is a very broad subject, with applications in a vast number of different fields. In generally one can say that statistics is the methodology for collecting, analyzing, interpreting and drawing conclusions from information. Putting it in other words, statistics is the methodology which scientists and mathematicians have developed for interpreting and drawing conclusions from collected data. Everything that deals even remotely with the collection, processing, interpretation and presentation of data belongs to the domain of statistics, and so does the detailed planning of that precedes all these activities