Chronic pain is often defined as pain that occurs constantly and flares up frequently, is not caused by cancer, and is experienced at least once a month for a 1-year period of time. Many articles have been written about the relationship between chronic pain and the age of the patient. In a survey conducted on behalf of the American Chronic Pain Association in 2004, a random cross section of 800 adults who suffer from chronic pain found that 424 of the 800 participants in the survey were above the age of 50. Place a 95% confidence interval on the proportion of persons suffering from chronic pain that are over 50 years of age. 0.405, 0.601) O (0.495, 0.565) O (0.361, 0.631) O (0.452, 0.542)