Collecting Data - Questionnaires

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Questionnaires: 

Using a form - 

Pros

  • Cheap
  • Easy
  • People can take their time answering.

Cons

  • People can misunderstand questions.
  • People can make mistakes when answering.
  • People may miss out questions.
  • People may not return the form.

Interviewing - 

Pros

  • You can make sure that people understand questions.
  • You can make sure people answer everything.

Cons

  • It takes a long time
  • If you pay an interviewer, it's expensive.

Non-response = when people do not return the form. 

You can't just ask another person instead, or

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