a phonebook may be used as a sampling frame to draw a sample of respondents to evaluate a new safety product. the problem is that people in the population who are more safety conscious may be unlisted; i.e., they requested not to be listed in the phonebook. so, the estimate we get using the phonebook will be different than the estimate we would have had if the sample was drawn from the entire population of the city. what error is this? a phonebook may be used as a sampling frame to draw a sample of respondents to evaluate a new safety product. the problem is that people in the population who are more safety conscious may be unlisted; i.e., they requested not to be listed in the phonebook. so, the estimate we get using the phonebook will be different than the estimate we would have had if the sample was drawn from the entire population of the city. what error is this?
