Chapter 16.1, Problem 3JC

A Pew Research study regarding cell phones asked about cell phone experience. One growing concern is unsolicited advertising in the form of text messages. Pew asked cell phone owners, “Have you ever received unsolicited text messages on your cell phone from advertisers?” and 17% reported that they had. Pew estimates a 95% confidence interval to be 0.17 ± 0.04, or between 13% and 21%.

Are the following statements about people who have cell phones correct interpretations of that confidence interval? Explain.

6. We are 95% confident that between 13% and 21% of all U.S. cell phone owners have received unsolicited advertising text messages.