Lecture Outlines-Stat Methods-1.12.2008

# Lecture Outlines-Stat Methods-1.12.2008 - Statistical...

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Statistical Methods for Criminal Justice Lecture Outline for Traditional Program: Purpose of Statistics, Foundations of Research And Data Organization I. Statistics – The science of collecting, describing, analyzing, and interpreting observations. A. Statistics is the foundation of the study of crime. 1. Therefore, the study of crime necessitates an understanding of statistics. II. Descriptive and Inferential Statistics A. There are two classes of statistics: descriptive and inferential. 1. Your research goal determines the type of statistics you will use. 2. If your goal is to describe your observations, this can be accomplished by using descriptive statistics. a. Descriptive Statistics 3. It is only when you go beyond listing your observations and begin summarizing your observations in meaningful ways that you need descriptive statistics. 4. If your goal is to move beyond describing your particular sample of observations and make some statements about what is occurring in a given population from which you drew your sample, then you need to use inferential statistics. a. Inferential Statistics 5. Knowledge of descriptive statistics is a prerequisite for understanding inferential statistics. III. Parametric and Nonparametric Statistics A. Inferential statistics are classified into two separate groups: 1. Parametric Statistics 2. Nonparametric Statistics – Make no assumptions concerning the level of measurement or the distribution of the data in the population. 3. Which type of inferential statistics is preferred? IV. From Samples to Populations A. Sample B. Population

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C. It is impossible to draw a sample prior to defining clearly our population. D. Researchers are usually interested in learning about populations, not samples of them. E. What does it mean to say that a sample is representative of the population from which it is drawn? 1.
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• Spring '08
• STRUGATZ
• Frequency distribution, Level of measurement, Exploratory Research Descriptive Research, Foundations of Research And Data Organization

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Lecture Outlines-Stat Methods-1.12.2008 - Statistical...

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