Chapter 2
Frequency Distributions

 I. Raw Data

II. Rank Distributions

III. Simple Frequency Distributions

IV. Range = High Score - Low Score

V. Grouped Frequency Distributions

A. Class Intervals....Creating Class Intervals (a worked problem)

1. Number...Must have between 10 and 20 intervals

2. Size (i)...2, 3, 5, 10, 15, 20, 25, 50, 100......

3. Apparent Limits...LAL must be a multiple of the interval size

4. Real Limits...LAL - .5 units and UAL + .5 units

5. Midpoint

B. Frequency...F

C. Relative Frequency...RF

D. Cumulative Frequency...Add frequency from the bottom...CF

E. Cumulative Relative Frequency...CRF

F. Cumulative Percent...C%



or



G. Creating an Entire Frequency Distribution (a worked problem)

H.  Visual Summary:  Creating a Grouped Frequency Distribution

Copyright © 2004 by Mark W. Vernoy