AP®︎ Statistics: Topic 2.2 Flashcards

Master key terms and definitions for Topic 2.2 of AP Statistics – Summary Statistics for Two Categorical Variables to help you prep for quizzes and the AP exam.

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Term

Two-Way Table; Contingency Table

Definition

Table that summarizes counts for individuals classified by two categorical variables

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Two-Way Table; Contingency Table
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Table that summarizes counts for individuals classified by two categorical variables

2.2.A
Joint Relative Frequency
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Interior cell frequency divided by the grand total; proportion of all individuals in a particular combination of categories

2.2.A2.2.A.1
Marginal Relative Frequency
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Row total or column total divided by the grand total; describes one variable’s distribution ignoring the other

2.2.A2.2.A.2
Conditional Relative Frequency
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Cell frequency divided by the total for the conditioning row or column; describes a distribution within a specified category of the other variable

2.2.A2.2.A.3
Conditional Distribution
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Set of conditional relative frequencies for one variable within a given category of the other variable; each conditioned row or column sums to 1

2.2.A2.2.A.3
Association
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For two categorical variables, the conditional distribution of one variable differs across categories of the other; equivalently, knowing one variable gives information about the other

2.2.B2.2.B.1
No Association
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The conditional distribution of one variable is the same across categories of the other; knowing one variable does not change the relative frequencies of the other

2.2.B2.2.B.1
Compare Conditional Relative Frequencies
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To assess association, compare corresponding conditional relative frequencies across groups; raw counts alone are generally not sufficient

2.2.B2.2.B.1