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...Introduction definition we can define statistics in two ways plural sense it is an aggregate or collection of numerical facts singular the science collecting organizing presenting analyzing and interpreting data for purpose assisting making a more effective decision classifications depending on how be used divided to main areas branches descriptive concerned with summary calculations graphs charts tables inferential method generalize from sample population prepared by getahun g woldemariam ambo university woliso campus example average income all families ethiopia estimated figures obtained few hundred important because statistical usually arises techniques based probability theory are required stages investigation there five steps any process measuring gathering assembling raw up which collected variety one most common methods through use survey also done different three telephone mailed questionnaire personal interview exercise discuss advantage disadvantage above respect each other o...