1. An important consideration in random digit dialing surveys is bias introduced by non-responders. 2. He does hold the world record for memorizing 22 random digits in just four seconds ." 3. The generated a stream of pseudo-random digits . 4. The telephone numbers were formed by random digits , thus permitting access to both listed and unlisted numbers. 5. For each exchange, the telephone numbers were formed by random digits , thus permitting access to listed and unlisted numbers. 6. For each exchange, the telephone numbers were formed by random digits , permitting access to both listed and unlisted numbers. 7. For each exchange, the telephone numbers were formed from random digits , permitting access to both listed and unlisted numbers. 8. For each exchange, the telephone numbers were formed by random digits , thus permitting access to both listed and unlisted numbers. 9. Within each exchange, random digits were added to form a full telephone number, thus allowing access to listed and unlisted numbers. 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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