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Chapter 3 for Stats

# Chapter 3 for Stats - Chapter 3 Percentiles Percentiles...

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Chapter 3 Percentiles

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Percentiles standard score: score that is derived from raw data and has a known basis for comparison allow evaluation of raw scores and comparisons of two data sets that are based on different measurement units percentile: position on a continuous scale of 100 theoretical divisions such that a certain fraction of the population of raw scores lies at or below that point
Ceiling effect Can have problems of interpretation when considering the extreme ends of a scale of a data set Example: Olympic athletes

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Common Percentile Divisions
Calculations using Percentiles: Rank Order Distributions Example: Determining the percentile from the score using the freshwater drum lengths from Ch2 What is the percentile rank of a length of 84? Determine fraction of scores falling at or below 84. 15/18 x 100 = 83.3 Rank Order Distribution: 58 60 64 65 66 71 71 72 77 78 79 81 81 83 84 86 88 95

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Learning Goal Be able to determine the percentile rank for a particular score within a rank order distribution.
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