Question: In a random sample of size 2,400, 420 have the characteristic of interest.
a. Compute the sample proportion p^ with the characteristic of interest.
b. Verify that the sample is large enough to use it to construct a confidence interval for the population proportion.
c. Construct a 90% confidence interval for the population proportion p.
d. Construct a 99% confidence interval for the population proportion p.
e. Comment on why one interval is longer than the other.