Chapter Two
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What are the Measures of Central Tendency?
Mode, Median, and Mean
What is the Mode of a data set?
The value that occurs most often
Not every data set has a mode.
The Mode is not very stable, changing just one number in a data set can change the Mode dramatically.
What is the central value of an ordered distribution?
The median
To find it
: Order the data
For an odd number of data values in the distribution
: Median + Middle data value
For an even number of data values in the distribution
: Sum f middle two values/2 = Median
For an ordered data set of size n
: Position of the middle value = n+1/2
What is the avearge that uses the exact value of each entry called?
The Mean
To compute the Mean
: Mean = Sum of all entries/Number of entries
What is the notation used to indicate the sum of all data?
X
What is the symbol used to represent to sum all the entries in the distribution?
summation symbol
What is the Range?
The difference between the largest and smallest values of a data distribution.
Card Set Information
Author:
dcahill6
ID:
101144
Filename:
Chapter Two
Updated:
2011-09-12 01:00:54
Tags:
Understandable Statistics
Folders:
Description:
MCC/Keating
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