A researcher carries out 20 unstructured interviews on the same topic as 20 structured interviews, which each covered a fixed set of 3 themes. For each unstructured interview, she records the number of distinct themes mentioned by the respondent: 2, 3, 3, 4, 5, 3, 4, 2, 3, 5, 4, 3, 3, 4, 2, 5, 3, 4, 3, 4
Calculate the mean number of distinct themes mentioned per unstructured interview, and use this to comment on the richness of data produced by the unstructured interviews compared with the structured interviews.
(Total for Question 16 is 4 marks)