Changes

'''Random Digit Dialing''' is used to poll a large amount of households during telephone polls. In the past twenty years "Random Digit Dialing" has greatly increased, and is being used by both private, and public organizations when taking phone surveys.<ref>http://www.amstat.org/sections/srms/proceedings/papers/1997_121.pdf</ref>

'''Random Digit Dialing''' is used to poll a large amount of households during telephone polls. In the past twenty years "Random Digit Dialing" has greatly increased, and is being used by both private, and public organizations when taking phone surveys.<ref>1</ref>

 

 

[http://www.amstat.org/sections/srms/proceedings/papers/1997_121.pdf 1]