1a. Working with a local library system, we are going to Survey on services used by the cardholders.The cardholder directory will be our Sampling Frame. It contains 1,200 names, for 5 branch locations. If the cardholders borrow materials including books (40%), periodicals (20%), music (10%), and videos (30%), how could we perform a Stratified Random sample?What issues should we address?

b. The cardholder directory is confidential, so we cannot read it.How could we perform a Cluster sampling?