Statistics and sampling

Statistics and sampling

1. the statistical method allows

   • They are classified and presented by:
     • charts, graphs
       • allowing data purification in two aspects
         • clear presentation and in its simplification
           • provides large amounts of information presented in summary form
             • We divided the statistical elaboration process into 6
               • the analysis and the search for relationships since we work on abstractions
               • planning or preparation, collection, critique and coding, processing, analysis and interpretation, publication
       • analysis of data that is recorded as a chronological order occurs
         • prices, sales, accidents, exports, inventories
           • next
             • plannig and preparation of a statiscal investigation
               • all statiscal data collection in fact requires the prior estabilishment of a plan
                 • must contemplate
                   • the object of the investigacion, the purpose, the source of information, the procedures, the material, the cost and its financing
                     • research objetive
                       • refers to the fact or phenomenon that we are goin to observe and record numerically
                         • in the project analize that we are going to investigate we propose
                           • define the object or purpose of the investigation,determine its quantitative and qualitative nature, determine the possibility of its investigation,and limit the investigable object
                             • two examples
                               • one biostatiscal and the other economic
                                 • depending on the type of research in question, the accuracy may be greater or less, and this must be established in the research project
                                   • the limitation of the field of research includes four aspects
                                     • space, time , the number of cases and the combination of the previous three
                                       • in the collection of prices, it is not made of all the articles that are offred and demanded in the markwt
                                         • practical procedures are
                                           • choose randomly without intentionally looking for edge caseas, choose by extreme cases
                                             • the sources of information
                                               • direct and indirect
                                                 • we directly collect data on an event of any kind, observe it and note its presence or absence
                                                 • indirectly we investigate in statistics, when a fact other than the one that interests us is used, to later deduce the value of the one that we ultimately wanted to know
   • indictment procedures
     • characterististcs
       • clarity and publicity, simplicity , utility
     • statistical material
       • it is made up of all the tools,documents or instruments necessary to carry out the investigation successfully

2. Martínez, C. (2012). Capítulo 1 (pp 31). Estadística y muestreo, 13a ed. [Online]Ecoe Ediciones.