There are 30,000 students enrolled at City University. 1) A simple random sample of 400 City University students was taken at the end of the spring semester. Of the students in the sample, 134 said that they plan to do volunteer work over the summer.
a) Find a 95% confidence interval for the percentage of all enrolled students who plan to do volunteer work over ther summer.
b) Find a 90% confidence interval for the percentage of all enrolled students who plan to do volunteer work over the summer.