COMM 291 Chapter 1-4: Business Statistics Notes Chapters 1-4
16
COMM 291 Full Course Notes
Verified Note
16 documents
Document Summary
Subjects / participants: people on whom we experiment. Companies, websites, and other inanimate subjects are often called experimental units. In a database, rows are called records / cases. The characteristics recorded about each individual/case are called variables. Usually shown as the columns of a data table. In a relational database, two or more separate data tables are linked so that information can be merged across them. When a variable names categories and answers questions about how cases fall into those categories, we call it a categorical variable. Descriptive responses to questions are often categories: what type of fund do you invest in , do you invest in the stock market? . Area code (we don"t care the number, but use them to categorize phone number into a geographical area) Ask, does our variable tell us the quantity of something measured? yes quantitative no - categorical.
