Question: According to Gallup s annual poll on personal finances, while most U.S. workers reported living comfortably now, many expected a downturn in their lifestyle when they stop working. Approximately half said they have enough money to live comfortably now and expected to do so in the future (J. M. Jones, Only Half of Non-Retirees Expect to be Comfortable in Retirement, The Gallup Poll, galluppoll.com, May 2, 2006). If you select a random sample of 200 U.S. workers,
a. what is the probability that the sample will have between 45% and 55% who say they have enough money to live comfortably now and expect to do so in the future?
b. the probability is 90% that the sample percentage will be contained within what symmetrical limits of the population percentage?
c. the probability is 95% that the sample percentage will be contained within what symmetrical limits of the population percentage?