Answer: Stratified Random Sampling
Stratified random sampling is a sampling technique that is used when clearly identifiable subgroups or subpopulations can be distinguished in the population. As shwon in this specific case of the survey about te average temperature, where a group of cities is chosen.
Through this, the selection of the elements that will form part of the sample is made separately in groups (called strata), and within each stratum a simple random sample is drawn, without leaving any stratum without sampling.
