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Unformatted text preview: 3.72. (a) This design would omit households without telephones or with unlisted numbers. Such households would likely be made up of poor individuals (who cannot afford a phone), those who choose not to have phones, and those who do not wish to have their phone numbers published. (b) Those with unlisted numbers would be included in the sampling frame when a random-digit dialer is used....
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- Spring '08