(Solution) - Through their Roper Reports Worldwide GfK Roper conducts a global -(2025 Original AI-Free Solution)

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Through their Roper Reports Worldwide, GfK Roper conducts a global consumer survey to help multinational companies understand different consumer attitudes throughout the world. Within 30 countries, the researchers interview 1000 people aged 13-65. Their samples are designed so that they get 500 males and 500 females in each country.
a) Are they using a simple random sample? Explain.
b) What kind of design do you think they are using?