b) Student Union at the local university sampled 80 textbooks at the University Bookstore and determined that of these 80 textbooks. 80% had been marked up in price more than 50% over wholesale cost.

)i Construct a 92% confIdence interval for the proportion of books marked up more than

50% by the University Bookstore.

(ii) The University Bookstore claimed that the propoJ4on of books marked up more than 50% is 70%. With 0.08 sIgnificance level, can you test the University Bookstor&s claim only based on the result in (I)? Why and how?