From the 2010 GSS subsample, we find that 72.7% of respondents believe in some form of life

Question:

From the 2010 GSS subsample, we find that 72.7% of respondents believe in some form of life after death (N = 1,500).
a. What is the 95% confidence interval for the percentage of the U.S. population who believe in life after death?
b. Without doing any calculations, make an educated guess at the lower and upper bounds of 90% and 99% confidence intervals.