Topic: Variables, Data Types and Questions

When One Concept Produces Several Variables

Variables, Values, and Data Records

Units of Measurement and Numerical Meaning

Turning Broad Topics Into Statistical Questions

Statistical Questions and Questions With Fixed Answers

Specifying Who and When in a Data Question

Operational Definitions for Everyday Concepts

Nominal and Ordinal Categories

Multiple-Response Questions as Data

Missing, Unknown, and Not Applicable Values