Answer:
Reliable
Explanation:
Reliability is a term used in psychological statistics research. It is related to the consistency of a research study and the measuring of the test.
There are two types of reliability that are used in research methodology.
The internal reliability: The internal reliability assesses the reliability within the group.
The external reliability: The external reliability assesses the reliability of the item outside of the group or between two groups.
Thus here in the above statement, the researcher used reliability to assess the consistency of the items in the research methodology.