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PSY207
B
Spring 2011
Psychological Statistics
III. Central Tendency
Objectives
You should be able to
....
• Define the term
measure of central tendency
• Define and compute:
• Mode
• Median
• Mean
• Compare the measures of central tendency when distributions are
skewed
Central Tendency
3.1 Introduction
Measures of Central Tendency
• Measures that describe where the
center
of a distribution of
scores is located
• Measures that represent the most
typical
or most
representative
scores in a distribution
• Three measures of central tendency
• Mode
• Median
• Mean
Central Tendency
3.1 Introduction
3.2 The Mean
3.3 The Median
3.4 The Mode
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Mode
• The most frequently occurring
score
in a frequency distribution
• Simplest measure of central tendency
Example: Ratings for desirability of body piercing
Survey 71 individuals on a 9 point scale
9
5
8
4
4
3
1
2
0
1
Rating
Frequency
6
15
7
25
8
7
9
2
∑
f = 71
Q: desirability of body piercing
123456789
Undesirable
Desirable
Extremely Undesirable
Extremely Desirable
Example: Ratings for desirability of body
piercing
9
5
8
4
4
3
1
2
0
1
Rating
Frequency
6
15
7
25
8
7
9
2
Extremely Undesirable
Extremely Desirable
Q: What is the mode?
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 Spring '07
 Pfordesher
 Mean

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