GfK Roper Consulting conducts a global consumer survey to help multinational companies understand different consumer attitudes throughout the world. In India, the researchers interviewed 1000 people aged 13 to 65 (www.gfkamerica.com). Their sample is designed so that they attract 500 males and 500 females.

a) Are they using a simple random sample? How do you know?

b) What kind of design do you think they’re using?