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... Why was that method more appropriate for this type of data Trang 21Observational & Experimental Studies  In an observational study, the researcher merely observes what is happening or what ...  Cluster Sampling:  Here the population is divided into groups called clusters by some means such as geographic area or schools in a large school district, etc Trang 19Applying the Concepts ... Inferential Statistics  Variables and Types of Data  Data Collection and Sampling Techniques  Observational and Experimental Studies  Uses and Misuses of Statistics  Software  Q&A Trang 4Statistics

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