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Psychology 210, Dr. Viji Sathy
Frequency Distributions
What is a Frequency Distribution?
Frequency Distributions: An organized tabulation of the number of individuals (or scores) located in each
category on the scale of measurement
1. A frequency distribution may be displayed in a table or a graph.
2. A frequency distribution may be ungrouped or grouped
A. Ungrouped Frequency Distribution:
List each individual score or category on the scale in order from lowest to highest or highest to
lowest
For each score or category, indicate the frequency, or the number of times it occurs in the data set
B. Grouped frequency distribution
Scores or values are grouped into intervals
For each interval, indicate the frequency or number of scores
Constructing Frequency Distributions
1. Example Ungrouped
Imagine we asked a class of 20 firstyear college students how many times they went out to party in the
previous week. Here are the fictional data:
1 2 7 6 1
2 6 5 4 4
0 3 2 2 3
4 3 5 4 4
Here is an ungrouped frequency distribution table:
X
f
7
1
6
2
5
2
4
5
3
3
2
4
1
2
0
1
Steps for constructing an ungrouped frequency distribution
1. HI/LO
Determine range (highest lowest score), if it’s less than 10 an ungrouped table would be appropriate
Make a column for these scores
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This note was uploaded on 02/23/2012 for the course WMST 101 taught by Professor Burns during the Fall '08 term at UNC.
 Fall '08
 Burns

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