What is considered a dependent measure in an experimental study?

In an experimental study, the dependent measure refers to the assessment used to evaluate the impact of the independent variable. It is the outcome that researchers measure to determine if and how the manipulation of the independent variable affects it. For example, if a researcher is studying the effect of sleep deprivation on cognitive performance, the cognitive performance would be the dependent measure. By analyzing the results relating to this measure, researchers can draw conclusions about the relationship between the independent variable and the outcome of interest.

The other options describe different aspects of an experimental study and do not fit the definition of a dependent measure. The variable manipulated by the researcher represents the independent variable, which is different from the dependent measure. The number of participants is related to the study's design and sample size but does not constitute a variable or a measure. Lastly, the research question outlines what the study aims to investigate rather than providing any data or outcome to assess.