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Lecture 2 - Organizaing and displaying data

# Lecture 2 - Organizaing and displaying data - Measurement...

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Measurement - process of obtaining test scores. Statistics - methodology for analyzing the scores to enhance interpretation.

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In this course, we use statistics: In this course, we use statistics: To describe a set of scores. To standardize scores. To estimate validity and reliability.
The Meaning of Statistics What does statistics means Is a body of techniques and procedures dealing with the collection, organization, analysis, interpretation, and presentation of information that can be stated numerically.

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The Uses of Statistics Descriptive statistics Deals with the enumeration, organization and graphical representation of data Inferential statistics Is concerned with reaching conclusions from incomplete information
Sources of Data Surveys and experiments Retrospective studies (case studies) Sample selection begins with the outcome variable Prospective studies (cohort studies) The stimulus variable is known advance

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Populations and samples Population
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