AP®︎ Statistics (pre-2026): Topic 3.6 Flashcards

Master key terms and definitions for Topic 3.6 of AP Statistics (pre-2026) – Selecting an Experimental Design 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This course has been archived.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

Completely Randomized Design

Definition

Experimental units are assigned to treatments entirely by chance, without forming groups first.

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Completely Randomized Design
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Experimental units are assigned to treatments entirely by chance, without forming groups first.

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Random Assignment Within a Completely Randomized Design
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Label all units, then use a random method to place them into treatment groups.

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Randomized Block Design
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Experimental units are grouped by a relevant characteristic, then randomly assigned to treatments within each group.

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Block / Blocking Variable
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A group of similar units, or the characteristic used to create those similar groups.

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Use All Blocks
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Every block must receive all treatments so treatment comparisons are made within each block.

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Matched Pairs Design
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A blocked design for two treatments using matched pairs or one subject receiving both treatments.

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Choosing Among Experimental Designs
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Choose the simplest appropriate design: randomize if units are similar, block known differences, and match pairs for two treatments.

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