Refer to given Example, in which for a sample of 1003 American adults, .56 was the proportion who think that it is somewhat or very likely that intelligent life exists elsewhere. Compute a 99% confidence interval for the population proportion.
Example
Is There Intelligent Life on Other Planets? In a 2008 Scripps Howard News/ Ohio University survey of 1003 randomly selected Americans, 56% of the sample said that it is either very or somewhat likely that there is intelligent life on other planets.
(Source: www.scrippsnews.com/node/34758).