Which of the following is a part of an observational study?

A) control of all variables

B) manipulation of participants

C) Collection of data

D) inclusion of bias

collection of data

Collection of data is the part of an observational study.

Option: (c)

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.