Question

An internet company 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. Complete parts a and b below.

​a) Are they using a simple random​ sample?

Answer 1

Roper is not using a simple random sample. The samples are calculated to get 500 males and 500 females. This would be very unlikely or improbable to take place in a simple random sample. The design that they are using is a stratified sampling (dividing the population into groups) with 2 strata and these are the males and females.