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Chapter 1 PPT

# Essentials of Statistics for the Behavioral Science

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Introduction to Statistics Chapter 1

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Today’s Lecture Introduce basic statistical and research terminology. Discuss important differences between research designs.
Question   Under what circumstances do you think you’ll need statistics? a = watching TV b = reading the paper c = renting an apartment d = negotiating a raise e = all of the above

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I. Introduction to Statistics A. Statistics: a set of procedures for organizing and interpreting data. B. General purposes. Descriptive – procedures used to summarize information in a set of data. Inferential – procedures used to reach conclusions about a whole group after measuring a small number of people.
Figure 1-3a (p. 8) The role of statistics in experimental research.

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Figure 1-3b (p. 8) Continued.
My Primary Goals A. To help you to become good consumers of facts and figures. B. To help you to evaluate research results from a professional perspective.

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II. Definitions A. Population – The whole group of individuals about whom a research result is to be generalized B. Sample – The subset of the population that is measure during data collection. 1. Representative sample. 2. Random sample.
Visual Representation

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Important lesson: Know your population
More Definitions C. Parameter : A value that describes a population. P opulation --> P arameter greek letters D. Statistic : A value that describes a sample.

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