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This episode focuses on statistical uncertainty.

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Census data becomes useful when the population, measure, geography, and time period are stated before anyone searches for a number.

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Every ACS estimate is accompanied by a margin of error at the stated confidence level.

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The margin helps express sampling uncertainty and should travel with the estimate in tables, charts, and decision memos.

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A larger estimate is not necessarily statistically different from a smaller one.

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Use the Census Bureau's statistical testing guidance rather than judging overlap by eye.

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Derived percentages and sums need correctly calculated uncertainty.

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Small groups and small geographies often have wide intervals.

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Suppress unstable rankings, combine categories only when substantively valid, or use a larger geography or longer period.

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Precision should determine the strength of the claim.

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Torrance application segment.

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This local application is separate from the Census Academy instruction.

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The cited City of Torrance primary source is General Plan: Housing Element materials, published at https://www.torranceca.gov/Government/Departments-Offices/Departments-Offices/Community-Development/Planning-Division/Comprehensive-Planning/General-Plan.

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For a local analysis, carry margins of error into housing-needs analysis and distinguish survey evidence from the City's adopted targets and site inventory.

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Do not present City policy or administrative records as Census Bureau findings, and do not present a federal estimate as adopted City policy.

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Keep a reproducibility packet containing the question, source URLs, exact vintage, table or query, geography codes, raw result, calculations, and uncertainty note.

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This narration is an original synthesis of cited U.S.

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Census Bureau government works and separately cited City of Torrance material.

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Third-party videos, software, graphics, and linked works are excluded.

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This product uses Census Bureau information but is not endorsed or certified by the Census Bureau.

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It is not an official City product and does not imply City endorsement.