Q5. Let us say we have users located in 3 countries. In the first country, there are 10,000 users, in the second country there are 3,000 users and in the third country there are 20,000 users. After sampling the data, 33% of cases seem to belong to the first country. What can we say about this sample?
a) The sample is representative for the population of users.
b) The sample needs to be weighted in order to take into account the number of users.
c) A higher weight should be attributed to the users in the first country.