UMass Amherst PUBHLTH 391B - Unit_1Introduction_Sampling (75 pages)

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Introduction to Biostatistic Slides adpated from Mine etinkaya Rundel of OpenIntro The slides may be copied edited and or shared via the CC BY SA license Learning Objectives Define biostatistics and elucidate its role in the research process Understand how samples are used to draw conclusions on populations Distinguish between probability and nonprobability sampling Understand sources of bias resulting from non probability sampling What is Biostatistics Application of statistical principles to medical public health and biological applications Collecting summarizing interpreting information and making inferences that appropriately account for uncertainty Types of Biostatistics Two types of biostatistics Descriptive Statistics deal with the enumeration organization and graphical representation of data from a sample Inferential Statistics deal with reaching conclusions from incomplete information that is generalizing from the specific sample Inferential statistics use available information in a sample to draw inferences about the population from which the sample was selected Rahbar Research Process Research question Hypothesis Identify research design Data collection What Biostatisticians Do Presentation of data Data analysis Interpretation of data Polgar Thomas 5 Where do we get data Sampling Slides developed by Mine etinkaya Rundel of OpenIntro The slides may be copied edited and or shared via the CC BY SA license Some images may be included under fair use guidelines educational purposes Useful Terminology Population is a class of individuals Parameters are numerical facts about the population Sample a subset of the population Sampling frame the list from which potential subjects are drawn Statistics are numerical factors about the sample Variable is something that can vary Data are the values you obtain by measuring variables Overview on sampling POPULATION unknown parameter Sample Data from Sample are used to describe or make inferences about Population Require an