There is a New York Times article available here it discusses how the rise of cellphone-only households has affected surveys. Read that article and respond to the following questions.

1. If you were going to conduct a telephone survey, how would you select your sample to ensure generalizability?

2. Should survey researchers now consider sampling in multiple ways (for example, both electronically and via the telephone)? If so, what types of issues should be considered when comparing results across two survey modes of administration? Do you think it would affect responses to questions soliciting information on sensitive issues such as victimization?

https://www.nytimes.com/2014/07/11/upshot/-how-the-rise-of-cellphones-affects-surveys.html