AP®︎ Statistics (pre-2026): Topic 1.8 Flashcards

Master key terms and definitions for Topic 1.8 of AP Statistics (pre-2026) – Graphical Representations of Summary Statistics to help you prep for quizzes and the AP exam.

This course has been archived. The College Board updated AP Statistics for the 2026–27 school year, and the units and topics changed.
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Term

Five-Number Summary

Definition

Minimum, Q1, median, Q3, and maximum values that summarize a quantitative dataset.

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Five-Number Summary
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Minimum, Q1, median, Q3, and maximum values that summarize a quantitative dataset.

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Quartiles
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Values that divide ordered data into four equal parts: Q1, median, and Q3.

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Interquartile Range (IQR)
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Q3 minus Q1; the spread of the middle 50% of the data.

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Fences and the 1.5 IQR Rule
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Lower fence is Q1 minus 1.5 IQR; upper fence is Q3 plus 1.5 IQR.

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Outlier on a Boxplot
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A value below the lower fence or above the upper fence, plotted separately.

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Describing Summary Statistics in Context
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Use center, spread, shape, and outliers from graphs to support claims about real data.

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Boxplot
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Graph of the five-number summary with a box, median line, whiskers, and separate outliers.

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Distribution Shape and Mean-Median Relationship
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Shape can be inferred from boxplots, and mean-median position helps identify symmetry or skew.

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