LECTURE 3
Data Presentation
SP110 STATISTICS FOR PSYCHOLOGY

OUTLINE
Frequency table
Histogram
Bar Graph

FREQUENCY TABLE
•
Provide a listing of individuals having each of the different values for a
particular variable.
•
In other word, it is a systematic listing of the number of scores (the
frequency) of each value in the group studied.
•
Example:
Stress ratings of 30 students:
8,7,4,10,8,6,8,9,9,7,3,7,6,5,0,9,10,7,7,3,6,7,5,2,1,6,7,10,8,8

STEPS FOR MAKING A FREQUENCY TABLE
Step1 :
Make a list down the page of each possible value, from lowest to
highest
Step 2
: Go one by one through the scores, making a mark for each next to
its value on the list
Step 3
: Make a table showing how many times each value on the list is used
Step 4
: Figure the percentage of scores for each value

Making a frequency table for the stress ratings scores. (Data based on Aron, Paris, and Aron, 1995.)

A FREQUENCY TABLE

USES OF FREQUENCY TABLES
•
Describes the data
•
Makes the pattern of the data clear
•
Shows how many scores there were for each value on the scale

Grouped Frequency Table
A frequency table that uses intervals
A grouped frequency table groups the
frequencies of adjacent values into
intervals.
A grouped frequency table can make
information even more directly
understandable than an ordinary
frequency table can.
Of course, the greater understandability of
a grouped frequency table is at a cost.
You lose some information: the details of
the breakdown of frequencies in each
interval.

Frequency Tables for Nominal Variables

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- Fall '19
- Frequency distribution, Bar chart, Histogram, Touring car racing, Aron, Click Range