Paying for music downloads. If you use the Internet, have you ever paid to access or download music? This was one of the questions of interest in a recent Pew Internet and American Life Project Survey (Oct. 2010). Telephone interviews were conducted on a representative sample of 1,003 adults living in the United States. For this sample, 506 adults stated that they have paid to download music. (a) Use the survey information to nd a point estimate for the true proportion of U.S. adults who have paid to download music. (b) Find an interval estimate for the proportion, part (a). Use a 90% condence interval. (c) Give a practical interpretation of the interval, part (b). Your answer should begin with \"We are 90% condent ...\" ((1) Explain the meaning of the phrase \"90% conden .\