What i believe to be either the biggest factor or just one of the main factors in public opinion polls and how they can get to be less than completely accurate is simple. First, it depends on the number of people polling and how many poll in total at the end of the day, because the more people you have to poll the less apt you will be for margin error, but the less people you have to poll the more apt you are for margin error.
Just the whole generic location of the polling. There was a poll map that was put out during the election, and it showed that the mass of the democratic votes were in the highly dense and populated cities, while the republican votes came from the countrysides.
So location could be one way to make public opinion polls inaccurate.
If the number in the sample is very small, the answer may not be the same as would be found in a larger group.
If you would ask a number of dog owners if cats would make good pets, the number who said yes may be small. If you asked the same of cat owners, the number may be too large.
You need to ask questions like these to a very large group and also they should have various opinions. More likely this group would reflect what a very large number would say.
The most common cause is improper sampling techniques.
gathering public opinion
Professional public opinion polling organizations, such as the Gallop Poll, would have on staff positions called Public Opinion Polling Specialists. Another title might be Public Opinion Analysts. They would most likely be supervised by Public Opinion Polling Managers or Supervisors.
George Gallup is considered the founder of modern polling. He developed innovative techniques for conducting public opinion surveys and founded the American Institute of Public Opinion, which later became the Gallup Organization. Gallup's work revolutionized the field of survey research and made polling a standard tool for measuring public opinion.
Gallup
bias.
Seeking input or soliciting feedback.
polling
Modern scientific polling uses sampling to get accurate statistics on public opinion. The sample is of the public is taken to represent the opinion of the larger public. This has become a proven and accurate way of conducting polls from the public.
Throughout the entire campaign.
A polling company attempts to predict the outcome of a presidential election, but only contacts people who subscribe to major political journals.
George E. Stevens has written: 'The student journalist and public opinion polling' -- subject(s): Public opinion polls
George Gallup is often considered the father of modern polling. He is credited with developing scientific polling methods that are still widely used today, such as random sampling and question wording. Gallup's work in the 1930s helped popularize the use of polls to measure public opinion.