For your marketing class, you’d like to take a survey from a sample of all the Catholic Church members in your city to assess the market for a DVD about the pope’s visit to the United States. A list of churches shows 17 Catholic churches within the city limits. Rather than try to obtain a list of all members of all these churches, you decide to pick 3 churches at random. For those churches, you’ll ask to get a list of all current members and contact 100 members at random.

a) What kind of design have you used?

b) What could go wrong with the design that you have proposed?