Answer:
C. The sample is carefully screened to ensure that it contains, proportionately, people with the same demographic profiles as encountered in the population.
Step-by-step explanation:
Sampling
This is a common statistics practice, when we want to study something from a population, we find a sample of this population.
When choosing a sample, you have to be careful, to avoid choosing a biased sample.
In this question:
Option A is not correct, as this wouldnt be representative of the entire population, since there is expected to be a significant number of people without these skills.
Option B is not correct, as we would not have a sample.
Option D is not correct, as a quickly selected sample could lead to bias.
Option E is not correct, as it could also lead to bias.
So the answer is given by option C.
