Answer:
Collection of data is the part of an observational study.
Option: (c)
Step-by-step explanation:
- Observational study is the non-experimental research that is usually used in the investigation of certain effects that is due to the treatment.
- The observational study is qualitative study. The major part of the observational study is to collect data and analyze it properly.
- It is used in many fields like sociology, psychology and statistical aspects.
- Mainly there are three types of observational study: cross-sectional, case-control and cohort study.