2_Lecture2.1_FrequencyDistribution_0121_Spring11

2_Lecture2.1_FrequencyDistribution_0121_Spring11 - II....

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1 PSY207 B Spring 2011 Psychological Statistics II. Frequency Distributions Objectives You should be able to. ... Tables •Define frequency distribution •Construct • an ungrouped frequency distribution •a grouped frequency distribution relative frequency distribution •Define and identify outliers II. Frequency Distributions 2.1 Introduction Frequency Distribution • An organized tabulation of the number of individual scores located in each category on the scale of measurement • Sorted collection of observations showing the number of times (or frequency) each observation occurs • Can be constructed either as a table or as a graph that presents the following two elements 1. The set of categories that make up the original measurement scale 2. A record of the frequency (number of individuals in each category) Frequency Distributions 2.1 Introduction 2.2 Frequency Distribution Tables
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2 Frequency Distribution Table • Present the measurement scale by listing the measurement categories (X values) in a column in order, and list the corresponding frequency of each category in the next column • The table can be constructed in two ways • ungrouped • grouped Measurement Categories (X values) Frequency x1 x2 x3 : : : f1 f2 f3 : : : Example • We are interested in the size of science classes in private elementary schools. • We surveyed 25 private schools and determined the number of students in each fifth grade science class: • 5 15 18 13 14 30 29 20 20 5 14 15 15 • 17 25 25 20 19 20 20 15 18 20 25 15 Ungrouped Frequency Distribution 5 15 18 13 14 30 29 20 20 5 14 15 15 17 25 25 20 19 20 20 15 18 20 25 15 # of Students Frequency 5 15 18 13 14 30 29 20 20 5 14 15 15 17 25 25 20 19 20 20 15 18 20 25 15 # of Students Frequency Ungrouped Frequency Distribution 1. Identify the range 5 15 18 13 14 30 29 20 20 5 14
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2_Lecture2.1_FrequencyDistribution_0121_Spring11 - II....

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