E's manager is concerned about bullying in the organisation and has asked E to report on the situation.

As a result, E has carried out the following work;

• Collected data of the numbers of complaints made

• Produced a bar chart based on incidences in different departments

• Interviewed a sample of employees

• Calculated the cost of employees being away from work sick due to bullying

Which of the pieces of work that E has carried out is qualitative analysis?