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Chapter 2
Describing, Exploring,
and Comparing Data
Chapter 2
Describing, Exploring, and
Comparing Data
2-1 Overview
2-2 Frequency Distributions
2-3 Visualizing Data
2-4 Measures of Center
2-5 Measures of Variation
2-6 Measures of Relative Standing
2-7 Exploratory Data Analysis (EDA)
2 -1
Overview
1. Center: A representative or average value that
indicates where the middle of the data set is located
2. Variation: A measure of the amount that the values
vary among themselves
3. Distribution: The nature or shape of the distribution
of data (such as bell-shaped, uniform, or skewed)
4. Outliers: Sample values that lie very far away from
the vast majority of other sample values
5. Time: Changing characteristics of the data over
time
Important Characteristics of Data
