A poll asked a group of people if the fact that they can make copies of songs on the Internet for free made them more likelylong dashor less likelylong dashto buy a performer's CD. Only 12% responded that it made them "less likely." The poll was based on a random sample of 691 Internet users. a) Check that the assumptions and conditions are met for inference on proportions. b) Find the 99% confidence interval for the true proportion of all Internet users who are "less likely" to buy CDs