In a survey of 700 community college students, 481 indicated that they have read a book for personal enjoyment during the school year (based on data from the Community College Survey of Student Engagement).
(a) Determine a 90% confidence interval for the proportion of community college students who have read a book for personal enjoyment during the school year.
(b) Determine a 95% confidence interval for the proportion of community college students who have read a book for personal enjoyment during the school year.
(c) What is the impact of increasing the level of confidence on the margin of error?