Stats Ch4 - 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.
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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 Geometric Trimmed Mean See Table 4.4 page 119
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Chapter 4 5 Mean Population Mean: Sample Mean: 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 of the data set. Prices of things- Houses, boats, etc. Whenever you have a large range of price it makes sense to use the median.
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Chapter 4 7 Mode The value that occurs most frequently in the data set.
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Chapter 4 8 Relationship between Mean, Median, and Mode Figure 4-15
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Chapter 4 9 Dispersion (See Table 4.11, p. 131) Range: Variance: Describes how the data vary about the mean.
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