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$15$ 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.

The percent of people who gave ring-no-answer during the January 1 to Easter period = $21.4\%$

The percent of people who gave ring-no-answer during the July 1 to August 31 period = $41.5\%$

All calls were made between $7$ and $10$ p.m.

Non-sampling mistakes, on the other hand, are the most significant errors in even the most meticulous surveys. These have nothing to do with selecting a sample and can be found in any census. Nonresponse is the single biggest issue with sample surveys: people can't be reached or refuse to respond. Response bias can occur when respondents give incorrect replies. Finally, the precise wording of questions has a significant impact on the responses.

The non-response rate is $41.5$ percent, which is quite significant. This will most likely happen between July and August. The majority of folks will be out of town during this time of vocation. As a result of the higher non-response rate, the sample is less representative of the population. As a result, it is less trustworthy.