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by: Golden Bernhard


Golden Bernhard
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Class Notes
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This 9 page Class Notes was uploaded by Golden Bernhard on Friday September 18, 2015. The Class Notes belongs to STA 6126 at University of Florida taught by Staff in Fall. Since its upload, it has received 21 views. For similar materials see /class/206585/sta-6126-university-of-florida in Statistics at University of Florida.


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Date Created: 09/18/15
Statistics 6126 Statistical Methods for Social Research Instructor Alan Agresti Course notes copyright by Alan Agresti 2009 not to be used without permission 1 Introduction Data Information collected to gain knowledge about a field or answer a question of interest Data Sources include Surveys Mail Telephone Internet Experiments Statistics Set of methods for collectinganalyzing data the art and science of learning from data Statistics provides methods for Design PlanningImplementing a study Sample survey or experiment How to choose people subjects for the study and how many Description Graphical and numerical methods for summarizing the data Inference Methods for making predictions about a population total set of subjects of interest based on a sample subset of the sample on which study collects data Parameter Numerical summary of the population Population mean Population proportion Statistic Numerical summary of the sample We use the sample statistic to make inferences about the population parameter Examples parameters statistics Parameter of adult Americans who approve of George W Bush s performance as President Mean reaction time to red light when using not using cell phone while driving Statistic of 1000 adult Americans in a poll who approve of Bush s performance as Pres Mean reaction time to red light for 100 students in experiment when using not using cell phone while driving Note Populations can be actual sets of people or conceptual hypothetical For good inferences need sample to be representative of population Statistical software such as SPSS is used to analyze data Software applies to data files Any one row contains observations for particular subject person in sample Any one column contains observations for a particular variable names of variables at top of file in first row Examples Go to wwwstatufleduaasocialdatahtml The first data file from a survey of 60 students at Univ of Florida looks like subject gen age high coll tv veg party ideology abor 1 m 32 22 35 3 n r 6 n 2 f 23 21 3515 y d 2 y 3 f 27 33 30 O y d 2 y 4 f 35 35 32 5 n i 4 y 5 M 23 31 35 6 n i 1 y When loaded by SPSS looks like B r 39 m M


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