Percentile Point and Rank Summary PDF
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Summary
This document provides a summary of percentile points and ranks, focusing on how to calculate these values from frequency distributions. It outlines the formulas and data required for both percentile points and percentile ranks. The document also mentions concepts of descriptive data such as total frequency, relative frequency, cumulative frequency and cumulative percentages.
Full Transcript
Summary of percentile point & rank: +-----------------------------------+-----------------------------------+ | **Percentile point** | **Percentile rank** | +===================================+===================================+ | What: A score according to scores | Wha...
Summary of percentile point & rank: +-----------------------------------+-----------------------------------+ | **Percentile point** | **Percentile rank** | +===================================+===================================+ | What: A score according to scores | What: scores below according to a | | below it. | score. | | | | | \*\*reverse of rank | \*\*reverse of point | +-----------------------------------+-----------------------------------+ | "What is the 75^th^ percentile | How many scores lie below the | | point?" | 75^th^ percentile point? | | | | | Out of total frequency of scores | | | in a data what is the 75^th?^ | | +-----------------------------------+-----------------------------------+ | Data needed: | Data needed: | | | | | = width of interval | = width of interval | | | | | XL = lower interval containing X | XL = lower interval containing X | | | | | X = percentile point | X = percentile point | | | | | Cum fP = total frequency below X | Cum fP = total frequency below X | | | | | Cum fL = cumulative frequency | Cum fL = cumulative frequency | | below interval of X | below interval of X | +-----------------------------------+-----------------------------------+  Descriptive data: 1. N = total frequency 2. Relative frequency= frequency of a score relative to N (total frequency of data) 3. Cumulative frequency (cum f)= sum of frequency of score including each score below it. 4. Cumulative percent % = cum f / N x 100% 
