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