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Introduction to Biostatistics

Introduction to BiostatisticsLarry WinnerDepartment of StatisticsUniversity of FloridaJuly 8, 20042 Contents1 Populations and Samples .. Types of Variables .. Quantitative vs Qualitative Variables .. Dependent vs Independent Variables .. Parameters and Statistics .. Graphical Techniques .. Basic Probability .. Diagnostic Tests .. Basic Study Designs .. Observational Studies .. Experimental Studies .. Other Study Designs .. Reliability and Validity .. Exercises .. 312 Random Variables and Probability The Normal Distribution .. Statistical Models .. Sampling Distributions and the Central Limit Theorem .. Distribution ofY.. Exercises .. 403 Statistical Inference Hypothesis Introduction to Hypothesis Testing .. Large Sample Tests Concerning 1 2(Parallel Groups) .. Elements of Hypothesis Tests .. Significance Level of a Test (Size of a Test) .. Power of a Test .. Sample Size Calculations to Obtain a Test With Fixed Power.

(categorical). We will use the terms numeric and categorical throughout this text, since quantitative and qualitative are so similar. The types of analyses used will depend on what type of variable is being studied. Examples include: VA1 CD 4 count represents numbers (or counts) of CD 4 lymphocytes per liter of peripheral blood, and thus is ...

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