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Unformatted text preview: Click to edit Master subtitle style 10/7/10 Frequency distributions PS214: Research Methods and Statistics in Psychology I 10/7/10 Homework #2 Hand it in. 10/7/10 For next time Readings l Howell, sections 2.62.8, 2.112.12 Assignments due l None Recommended l Howell, exercises 2.15, 2.17a, and 2.17b (about summation notation). Answers are in the back of the book (p. 736). 10/7/10 Todays agenda 1. Some basic terminology 1. Organizing and displaying data distributions 1. Describing data distributions 10/7/10 Colby men: Hot or not? A researcher wants to know how attractive male Colby students are, on average, on a scale of 1 (extremely unattractive) to 10 (extremely attractive). She recruits a random sample of 50 male Colby students and photographs each of them. 10/7/10 Basic terminology: Populations and samples The population is the group of things (e.g., people, behaviors, measurements) that a researcher ultimately wants to make conclusions about. l Whats the population of interest in this study? The sample is the group of things, drawn from the population, that the researcher actually observes in their study. 10/7/10 Basic terminology: Parameters and statistics A parameter is a value (e.g., number) that describes a population. l Whats the population parameter of interest in this study? A statistic is a value that describes a sample. l Whats the corresponding sample statistic? 10/7/10 Basic terminology: Descriptive and inferential Descriptive statistics are methods for summarizing information about a sample....
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 Spring '10
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