Final answer:
The sample size of the focus group in the survey conducted by the polling company is 8 people, who were selected from a total pool of 31 potential participants.
Step-by-step explanation:
The question asks to identify the sample size of a focus group in a survey conducted by a polling company. A sample size refers to the number of individuals from a larger population who are selected to participate in a study or survey. In random sampling, every person in the targeted population has an equal chance of being included in the sample, which helps ensure that the sample represents the broader population.
In the scenario described, the sample size of the focus group is 8 people. They were selected from a larger group of 31 individuals (14 people aged between 18 and 25, plus 17 other people who are not further described). The total number of people who could potentially have been surveyed is therefore 31, but the actual number of people surveyed for the poll is the 8 who make up the focus group.