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Unformatted text preview: Descriptive Statistics Quantitative Data 2 Quantitative Data Measurements that can be measured on a natural and meaningful numerical scale Examples: a) SAT score of students b) The current unemployment rate for 50 states c) Number of calls made over last week by 10 cell phone users 3 Discovering the Distribution When we summarize quantitative data we want to see the underlying distribution of the variable. Some of the values are more likely than others. DISTRIBUTION describes how the observations are spread over the range of the data. 4 Different Shapes The distribution could be skewed or symmetric. Consider income distribution: what can you say about the income distribution from common knowledge? The distribution will be like: This distribution is skewed to the right or positively skewed 5 Symmetric Distribution This distribution is symmetric and moundshaped This distribution is negatively skewed or skewed to the left...
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 Fall '10
 Balaji
 Statistics

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