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Section 1.1: Where Do Data Come From?

Section 1.1: Where Do Data Come From?. Individuals and Variables. Individuals are the objects described by a set of data. Individuals may be people, animals, or things. A variable is any characteristic of an individual. A variable can take different values for different individuals.

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Section 1.1: Where Do Data Come From?

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  1. Section 1.1: Where Do Data Come From?

  2. Individuals and Variables • Individuals are the objects described by a set of data. Individuals may be people, animals, or things. • A variable is any characteristic of an individual. A variable can take different values for different individuals.

  3. Types of Variables • Qualitative (also known as categorical) • Acts as label for data (color, size, etc.) • Usually, but not always, non-numerical • Quantitative (always numerical) • Mathematics can be performed on data (average, range, percentage, etc.) • Measured in units (dollars, feet, etc.)

  4. Which column(s) list the individuals? Which column(s) list the variables? Which variables are qualitative? Which variables are quantitative?

  5. Statistics about the Data What statistic(s) can you calculate for salary or age? Can you only calculate statistics for quantitative variables? What statistic(s) can you calculate for job type, gender, race?

  6. In Your Group • Write an example table showing an individual column and several variable columns. Include data in each column. • Be prepared to share the table with the class, including identification of individual, qualitative variables, and quantitative variables. • This will be turned in.

  7. Homework • Pages 7-8, #1-4. • Page 20, #18 a, b. • For these questions, go back to the main menu, and you can print a copy.

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