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9 Cards in this Set

  • Front
  • Back
objects described by a set of data.
-may be people, animals, or things.
any characteristic of an individual.
-can take different values for different individuals.
When you plan a statistical study or explore data from someone else’s work, ask yourself..
Why, Who, What.
Why =
What purpose do the data have?
-to answer specific questions?
-to draw conclusions about individuals other than those for whom we have data?
Who =
What individuals do the data describe?
How many individuals appear in the data?
What =
How many variables do the data contain?
What are the exact definitions of the variables?
What units of measurements describe each variable?
categorical variable
places an individual into one of several groups or categories.
quantitative variable
takes numerical values for which arithmetic operations make sense.
distribution of a variable
tells what values a variable takes and how often it takes these values.