| 1. | An important consideration in random digit dialing surveys is bias introduced by non-responders.
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| 2. | He does hold the world record for memorizing 22 random digits in just four seconds ."
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| 3. | The generated a stream of pseudo-random digits.
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| 4. | The telephone numbers were formed by random digits, thus permitting access to both listed and unlisted numbers.
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| 5. | For each exchange, the telephone numbers were formed by random digits, thus permitting access to listed and unlisted numbers.
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| 6. | For each exchange, the telephone numbers were formed by random digits, permitting access to both listed and unlisted numbers.
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| 7. | For each exchange, the telephone numbers were formed from random digits, permitting access to both listed and unlisted numbers.
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| 8. | For each exchange, the telephone numbers were formed by random digits, thus permitting access to both listed and unlisted numbers.
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| 9. | Within each exchange, random digits were added to form a full telephone number, thus allowing access to listed and unlisted numbers.
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| 10. | It's there for good reason, too strings of random digits or letters are hard to remember, making establishing someone's identity difficult.
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