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Welcome to EPS 525 Introduction to Statistics Dr. Robert Horn Summer 2008 Mondays – Thursdays 1:00 – 3:15 p.m.

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Introduction and Overview Introductions Program Prior Statistics Courses Biggest Fear/Concern Course Overview Course Syllabus Text

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Getting Started Basic Math Review Greek Alphabet Chapter 1 Questions 6, 7, and 8 Chapter 2 Questions 2 and 3

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Chapter 1 Statistics and Scientific Method Methods of Knowing Authority Rationalism Intuition Scientific Method

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Chapter 1, continued Definitions Population – Sample Variable – Constant Independent and Dependent Variables Active and Attribute IVs Data Statistic - Parameter Roman vs. Greek Symbols

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IV – DV Exercise For the experiment described below, specify the following: the independent variable, the dependent variable, the sample, and the population. A psychology professor, interested in gender differences and similarities, conducts an experiment to determine if women remember emotional events better then men. Fifteen female and 15 male undergraduate students are randomly sampled from the students enrolled in a very large section of Psychology 101; the females are assigned to Group 1, and the males are assigned to Group 2. Each student is shown a set of 20 highly emotional pictures, and allowed to study each for one minute. Two weeks later they are tested for recall of the details of each picture. The percent of picture details recalled by each student is determined, and averages for each group are compared to determine if gender affects recall of emotional events. Independent Variable: Dependent Variable: Sample: Population:

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IV – DV Exercise A psychology professor, interested in gender differences and similarities, conducts an experiment to determine if women remember emotional events better then men. Fifteen female and 15 male undergraduate students are randomly sampled from the students enrolled in a very large section of Psychology 101; the females are assigned to Group 1, and the males are assigned to Group 2. Each student is shown a set of 20 highly emotional pictures, and allowed to study each for one minute. Two weeks later they are tested for recall of the details of each picture. The percent of picture details recalled by each student is determined, and averages for each group are compared to determine if gender affects recall of emotional events. Independent Variable: Gender (w/ 2 levels: Male and Female) Dependent Variable: Memory for Emotional Events Sample: 15 males and 15 females (randomly selected students) Population: Students enrolled in very large section of Psychology 101

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Chapter 1, continued Scientific Research and Statistics Observational Studies True Experiments Random Sampling Descriptive and Inferential Statistics Using Computers in Statistics Statistics and the “Real World”

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Chapter 2 Descriptive Statistics Study Hints for the Student Mathematical Notation Summation Measurement Scales Nominal Ordinal Interval Ratio

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Chapter 2, continued Measurement Scales in the Behavioral Sciences Continuous and Discrete Variables Discrete – a.k.a. Categorical Real Limits of a Continuous Variable Significant Figures Rounding

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Figure 2.1, p. 30

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Figure 2.2, p. 32

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