AP®︎ Statistics: Topic 1.11 Flashcards

Master key terms and definitions for Topic 1.11 of AP Statistics – Random Sampling to help you prep for quizzes and the AP exam.

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Term

Sampling Without Replacement

Definition

Selected units are not returned before later selections, so a unit can be chosen only once

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Sampling Without Replacement
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Selected units are not returned before later selections, so a unit can be chosen only once

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Sampling With Replacement
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Selected units are returned before later selections, so the same unit can be chosen more than once

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Simple Random Sample (SRS)
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A sample of size n selected so every possible sample of n distinct population units has the same chance of being chosen

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Stratified Random Sample
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Divide the population into nonoverlapping strata, take a random sample from each stratum, and combine the selected units

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Cluster Random Sample
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Divide the population into clusters, randomly select some clusters, and collect data from every observational unit in the selected clusters

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Systematic Random Sample
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Choose a random starting point, then select every kth unit using a fixed interval

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Stratified vs. Cluster Sampling
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Stratified: sample individuals from every stratum; strata are ideally homogeneous within. Cluster: randomly select some clusters and include everyone in them; clusters are ideally heterogeneous within and similar to one another

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