Answer:
b. Observational measures cannot be used in making causal claims
Explanation:
Observational data: The term observational data is defined as the information or data being gathered in the absence of the research participants, for example, employees but the activities of the participants are being recorded explicitly. In this case, the data or information being gathered had not been manipulated by the researcher.
Observational data can be gathered through various methods, such as the survey method. The data or information is collected is usually qualitative but it can also be mixed or quantitative as well.
In the question above, the statement which is not true for observational data is observational measures cannot be used in making causal claims.
