The term 'OPINION SAMPLE' can be broken down into two crossword solutions: POLL (4 letters) and SAMPLE (7 letters). A POLL is a survey of public opinion, usually conducted by asking people a series of questions. Polls are used to measure the opinions of a population on a variety of topics. A SAMPLE is a subset of a population that is used to represent the entire population. Samples are used in polls to provide an accurate representation of the population's opinion.