07_Central_tendency_and_variability

07_Central_tendency_and_variability - Click to edit Master...

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Unformatted text preview: Click to edit Master subtitle style 10/7/10 Central tendency and variability PS214: Research Methods and Statistics in Psychology I 10/7/10 Homework #2 Come and get it. Answer key available on the course website. 10/7/10 Exam #1 Exam #1 will be next Thursday, October 7. At least part of our class meeting on Tuesday will be a review session. l Question-and-answer format, so come with questions. See the study guide for further details. 10/7/10 For next time Readings l None Assignments due l Homework #4 l Lab #4 l Come with questions for review. 10/7/10 Today’s agenda 1. Central tendency 1. Variability 10/7/10 How happy are Colby students? A researcher wants to know how happy Colby students are, on average, and so administers the Satisfaction With Life Scale (SWLS) to a random sample of 12 Colby students. Measure has 5 items, rated on a 1-to-7 agreement scale. 1. In most ways my life is close to my ideal. 2. The conditions of my life are excellent. SWLS: Diener, Emmons, Larsen, and Griffith (1985) 10/7/10 Life-satisfaction scores for 12 Colby students 34 10 30 23 19 25 19 26 18 27 24 27 10/7/10 Central tendency Indices of centr al tendency summarize information about the “average” or center-point of a set of scores. Three commonly used indices 1. Mode 2. Median 3. Mean 10/7/10 Central tendency: The mode The mode (Mo) is the most frequent value. How to find the mode 1. Order the scores from smallest to largest. 2. Identify the most frequent score(s). A data distribution could have multiple modes. 10/7/10 Life-satisfaction scores: Smallest to largest 10 18 19 19 23 24 25 26 27 27 30 34 10/7/10 Life-satisfaction scores: Mode 10 18 19 19 23 24 25 26 27 27 30 34 Modes = 19, 27 10/7/10 Central tendency: The median The median (Mdn) is the value that 50%...
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This note was uploaded on 10/06/2010 for the course ES ES271 taught by Professor Machaut during the Spring '10 term at Colby.

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07_Central_tendency_and_variability - Click to edit Master...

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