COMMERCE 2QA3 Chapter Notes - Chapter 2: Bar Chart, Unimodality, Standard Deviation
30 Sep 2013
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Transactional data: data collected from recording company"s transactions. Business analytics: any use of statistical analysis to drive business decisions from data. Data helps businesses predict what customers may buy in future. Help them know mow much of each item to stock. Need to provide context for data values. Must answer who, what, when, where, why, how. Data table: usually the rows answer who, column headers answer what. Experimental units: companies, websites, inanimate subjects that are experimented on. Variables: characteristics recorded about each individual or case. Relational database: two or more separate data tables that are linked together so info can be merged across them. Analysis performed on single data table in statistics. Categorical variable: when variable names categories and answers questions about how cases fall into those categories. Quantitative variable: when variable has measured numerical values and tells us about the quantity of what is measured, some have units (kg, cm, etc. ) and some do not.
