AP®︎ Statistics: Topic 1.2 Flashcards

Master key terms and definitions for Topic 1.2 of AP Statistics – Variables to help you prep for quizzes and the AP exam.

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Term

Observational Unit

Definition

Item or individual from which a datum is collected

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Observational Unit
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Item or individual from which a datum is collected

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Variable
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Characteristic that may change from one observational unit to another

1.2.A1.2.A.2
Datum (Data Value)
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One piece of information recorded for an observational unit; one recorded value

1.2.A1.2.A.3
Categorical Variable (Qualitative Variable)
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Variable whose values are category names or group labels

1.2.B1.2.B.1
Quantitative Variable (Numerical Variable)
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Variable whose values are numerical amounts that measure or count something, usually with units

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Discrete Quantitative Variable
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Quantitative variable with a countable number of possible values

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Continuous Quantitative Variable
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Quantitative variable that can take any value within a given interval

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Parameter vs. Statistic
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Parameter describes a population; statistic describes a sample

1.2.A1.2.A.4