Question

An experiment is valid if it:

can be replicated by another researcher and provide similar results.
can accurately predict future behaviors.
can disprove the research hypothesis.
measures what it is supposed to measure.

Answer 1

An experiment is valid if it **measures what it is supposed to measure**. This means that the experiment accurately assesses the concept or phenomenon it is intended to analyze, which is a key aspect of validity in research. While replication and the ability to predict future behaviors are important aspects of research reliability and applicability, they do not specifically define the validity of the experiment itself. Additionally, the ability to disprove a hypothesis relates to falsifiability but is not a direct measure of the validity of the experiment. Therefore, the best answer from the options provided is that for an experiment to be valid, it must measure what it is supposed to measure.