January 18, 2008

January 18, 2008 - Percentile rank: the percentage of...

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January 18 Outline I. Computing percentile ranks A. Similar steps as percentile, different equation: P. rank = cumf L + ( f i /i) (X - X L ) x 100% N II. Graphing frequency distributions A. Basic rules B. Bar graph (nominal or ordinal data) C. Histogram (interval or ratio data) D. Frequency polygon (interval or ratio data) 1.Shapes a. Symmetrical b. Normal c. Skewed E. Graphing on SPSS III. Intro. to Chapter 4—Central Tendency and Variability
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Unformatted text preview: Percentile rank: the percentage of scores with values lower than the score in question Symmetrical: a property of a frequency polygon if when folded in half on the X axis the two sides coincide Normal curve: a type of symmetrical frequency polygon that is bell-shaped; represents the distribution of many human qualities Skewed: a property of a frequency polygon if it is not symmetrical...
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This note was uploaded on 04/17/2008 for the course PSYC 241 taught by Professor Jamesantes during the Spring '08 term at North Dakota.

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January 18, 2008 - Percentile rank: the percentage of...

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