Nn Landers – who wrote a daily advice column appearing in newspapers across the country – once asked her readers, "If you had it to do over again, would you have children?" Of the more than 10,000 readers who responded, 70% said no. (I’m certain your parents would say yes!) What does this show?

The survey is not useful because of the bias or sentimental views of readers response.

Step-by-step explanation:

This survey gives a good example of voluntary bias response from viewers, which often represents negative opinions or views.

The readers or people who  responded  were most likely parents who were not happy about their situation, and so there is very small chance that the 10,000 readers or respondents  were representing  the populace . taking a sample or Knowing more about her readers, would not have changed the the views or opinions of people.