Assignment:
America's young people are heavy Internet users: 87% of Americans ages 12 to 17 are Internet users (The Cincinnati Enquirer. February 7. 2006). My Space was voted the most popular website by 9% in a sample survey of Internet users in this age group. Suppose 1400 youths participated in the survey. What is the margin of error, and what is the interval estimate of the population proportion for which My Space is the most popular website? Use a 95% confidence level.
Provide complete and step by step solution for the question and show calculations and use formulas.