# Ch04 - Chapter 4 Descriptive Statistics Chapter 4 1...

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Chapter 4 1 Chapter 4 Descriptive Statistics

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Chapter 4 2 Numerical Summaries Numbers that describe samples are called statistics. Numbers that describe populations are called parameters.
Chapter 4 3 Recall our objective when looking at data summarized visually: 1. Central Tendency 2. Dispersion 3. Shape

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Chapter 4 4 Central Tendency Mean Median Mode Midrange Trimmed Mean See Table 4.4 page 119
Chapter 4 5 Mean Population Mean: Sample Mean: Entire sample Extreme values 1 N i i x N μ = = 1 n i i x x n = =

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Chapter 4 6 Median The value that lies at the center Extreme values Data gaps
Chapter 4 7 Mode The value that occurs most frequently Attribute (categorical) or small range discrete May not be unique

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Chapter 4 9 Relationship between Mean, Median, and Mode Figure 4-15

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10 Dispersion (See Table 4.11, p. 131) Range: Variance: Describes how the data vary about the mean. 2
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Ch04 - Chapter 4 Descriptive Statistics Chapter 4 1...

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