A01

• What are the types of questionnaires?

  Open and closed questions
• What are the type of closed questions?

  Likert, ranking, attitude, checklist
• Why do they use pilot studies?

  To amend the questions if there are any faults in their questionnaire
• Why is there a possibility of the investigator effect?

  The respondent may be influenced by the interviewers appearance, age and behaviour
• Why are sample sizes and response rates critical?

  A large, representative sample if you want to generalise findings

  A response rate of at least 80% is needed
• Why do they need to include the 'don't know' or 'other' option?

  So the respondents aren't forced to give a response that isn't a true of accurate reflection of their opinions