Questionnaires

3 features of open questions

-No fixed answer so participants can answer how they want

-Produce qualitative data

-Detailed BUT harder to analyse

3 features of closed questions

-Fixed number of responses

-Produce quantitive data

-Lacks detail BUT easier to analyse

3 types of closed questions

Checklist

Ranking

Likert response scale

4 strengths of questionnaires

-Quick

-Replication is easy

-Quantitive and qualitative data

-No investigator effects

5 weaknesses of questionnaires

-Misunderstanding could happen

-Biased samples

-Low return rates

-Not suitable for sensitive issues

-Social desirability bias

What is social desirability bias?

Participants lie in order to give what result is expected of them

How are questionnaires analysed?

Ordinal level of measurement then select the median