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(Lesson 6: Measures of Spread or Variation; 33)
3.15
LESSON 6: MEASURES OF SPREAD OR VARIATION
(SECTION 33)
PART A: THREE MEASURES
Example 1 (same as in
Lesson 5
)
The five students in a class take a test. Their scores in points are as follows:
80
76
100
83
100
Let’s look at three possibilities for measuring the spread or variation
of a
data set.
Note: All three of these measures are nonnegative in value.
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Unformatted text preview: 1) Range Range = Max − Min = highest value − lowest value in the data set ( ) In Example 1 Range = Max − Min = 100 − 76 = 24 points Pros: The range is quick and easy to find, and it seems like a natural measure of spread. Cons: The range uses only two of the data values (excluding ties), and it is extremely sensitive to outliers....
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This note was uploaded on 12/29/2011 for the course MATH 119 taught by Professor Kim during the Fall '09 term at SUNY Stony Brook.
 Fall '09
 KIM

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