These days, surveys based on random-digit dialing are complicated and expensive to conduct. For purposes of pilot tests or small-scale surveys, however, Research Randomizer can be used to provide an economical set of telephone numbers within a specified exchange (in the United States the telephone exchange, or "prefix," consists of the first three digits after the area code).
Suppose you are a survey researcher who wants to find out what people think about a local referendum. To gather the necessary information, you decide to call 100 people living in a particular area of the city and ask them about the issue. Because the phone numbers in this district begin with 392-0000 and end in 392-9999, you would use the Randomizer form to generate 1 set of 100 unique, unsorted numbers with a range from 3920000 to 3929999 (representing the range of phone numbers in this district).
Random Sample of 50 Subjects from a Population of 643
Random Assignment of 40 Subjects to 4 Conditions
Random Assignment of 40 Subjects in Blocks of 4
Random Sample of 100 Telephone Numbers
Random Ordering (Assignment) of 25 Items on a Test
