38. Wireless access. In Chapter 4, Exercise 36, we saw that the Pew Internet and American Life Project polled 798 Internet users in December 2006, asking whether they have logged on to the Internet using a wireless device or not and 243 responded “Yes.”

a) Find a 98% confidence interval for the proportion of all U.S. Internet users who have logged in using a wireless device.

b) Explain carefully what your interval means.

c) Explain what “98% confidence” means.