In a recent study of university libraries, undergraduate students were asked whether they thought that the libraries had an adequate collection of books. The survey results are stored in the attached data file.

1. Find an unbiased point estimate of the proportion of students who think that the collection is adequate (code as 1 = yes, 2 = no).

2. Find a 95% confidence interval for the proportion of students who think that the library collections are adequate.

3. According to the Ministry of Education statistics, the total number of students reaches 500,000. Set up a 95% confidence interval estimate of the population number of students who are not satisfied with the libraries books collection.