Opinion polls are made picking a portion of a population and asking them some questions about a given subject. These answers are, then, used to make an idea of what that population thinks about that subject.
The problem is the impossibility of asking the entire population what they think about the subject.
For example, 80% of the persons the poll interviewed agreed that studying is good as early as five years old. The opinion poll, then, will say 80% of the people from that location agreed to that studying starting from five years old is good. The persons asked totalize 5000, while the total population of that place is, for example, 100.000.
So, the statement that defines opinion pools is: opinion pools can give an idea of what a population thinks, but it might be misleading and can never be accurate enough.
