You may need to use the appropriate appendix table or technology to answer this question.Suppose in 2021, a national research center conducted a survey of 1,509 Internet users that provided a variety of statistics on Internet users. For instance, in 2021, 92% of adults in the United States were Internet users. In 1995 only 14% of adults in the United States used the Internet.
(a) Develop a 95% confidence interval for the proportion of American adults who identified as Internet users in 2021. (Round your answers to four decimal places.) __________to_________
(b) The sample survey showed that 78% of its adult U.S. respondents said they have a broadband connection at home. Develop a 95% confidence interval for the proportion of adults in the United States who say they have a broadband connection at home. (Round your answers to four decimal places.) ________to_________
(c) The sample survey showed that 14% of adults in the United States who say their smartphones are their primary means of online access at home. Develop a 95% confidence interval for the proportion of adults in the United States who say their smartphones are their primary means of online access at home. (Round your answers to four decimal places.) ______to______
(d) Compare the margin of error for the interval estimates in parts (a), (b), and (c). How is the margin of error related to the sample proportion p?