How easy is it to conduct unscientific polls and insert bias into a poll at every question? What issues might these unscientific and biased polling methods present?

The Essay needs to answer the question:

How easy is it to conduct unscientific polls and insert bias into a poll at every question? What issues might these unscientific and biased polling methods present?

How do they impact the reporting of public opinion?.

The information MUST mostly come from the attached document although other sources can be used as additional information.