Ring-no-answer. A common form of nonresponse in telephone surveys is “ring-no-answer.” That is, a call is made to an active number but no one answers. The Italian National Statistical Institute looked at nonresponse to a government survey of households in Italy during the periods January 1 to Easter and July 1 to August 31. All calls were made between 7 and 10 P.M., but 21.4% gave “ring-no-answer” in one period versus 41.5% “ring-no-answer”

in the other period. Which period do you think had the higher rate of no answers?
Why? Explain why a high rate of nonresponse makes sample results less reliable.AppendixLO1