Exam1 Study guide.docx - Chapter 1 Introduction to data...

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Chapter 1: Introduction to data, variables, the research cycle, representative and nonrepresentative samples, and sampling strategies As a discipline, what is statistics? (Hint, it is not math though it uses math extensively)
What is a data set or data matrix? What do its rows represent? What do its columns represent?
What is an index? What is a “unit of observation” (aka “observational unit”)? What is the relationship between indexes and observational units?
What is the difference between categorical and numerical variables?
What is the difference between nominal and ordinal variables? Are they categorical or numerical variables?
What is the difference between indicator and multilevel variables? Are they categorical or numerical variables?
What is the difference between discrete and continuous variables? Are they categorical or numerical variables?