Giant cruise ships have been causing damage to Venice, Italy. The mayor's office of Venice would like to understand how the 50,000 residents feel about cruise ships travelling in the Grand Canal, through the historic city. Listed below, are several proposed sampling methods to survey residents. For each of the following, describe what type of sampling method is used. a) The city of Venice is divided into sestiere, or 6 districts. The mayor's office randomly selects one district and surveys every household in that district. b) Under Italian law, records of births, marriages, and deaths are maintained by the Registrar of Vital Statistics in Venice. Every 50th person born in Venice from 1920 to 2002 is selected and surveyed. c) Using the electoral roll, 1000 Venetian residents are randomly selected and asked to participate in the survey. d) Using the record of births, residents are divided into four age groups: 18 to 30 years, greater than 30 years to 45 years, greater than 45 years to 60 years, and greater than 60 years old. Say, 250 residents from each group are randomly selected and surveyed.
A) Stratified sampling
B) Systematic sampling
C) Simple random sampling
D) Cluster sampling
