7.30 Nonresponse. Academic sample surveys, unlike com mercial polls, often discuss nonresponse. In a survey of drivers, researchers called a random sample of all listed residential tele phone numbers in the United States. Of 45,956 calls, 5029 were completed.'^ What was the rate of nonresponse for this sample? (Only one call was made to each number. Nonresponse would be lower if more calls were made.)