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Key Concepts

I. How Data Are Generated

1. Experimental units, variables, measurements

2. Samples and populations

3. Univariate, bivariate, and multivariate data

II. Types of Variables

1. Qualitative or categorical

2. Quantitative

a. Discrete

b. Continuous

III. Graphs for Univariate Data Distributions

1. Qualitative or categorical data

a. Pie charts

b. Bar charts

©1998 Brooks/Cole Publishing/ITP

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