Answer:
<em>Independent variable: the ACT examination.
</em>
<em>Dependent variable
: anxiety.</em>
<em>Population
: American high schools.</em>
<em>Sample
: 11th graders. </em>
Explanation:
<em>Independent variable: </em>In research, the independent variable is the variable that is being manipulated or changed by a researcher or experimenter during experimentation or conducting research. Any changes or manipulation in the independent variable will cause a direct change in the dependent variable.
<em>Dependent variable:</em> In research, the dependent variable is the variable that is being tested or controlled by the experimenter or the researcher in an experiment.
<em>Population: </em>A particular group size being selected randomly by the researcher to study.
<em>Sample: </em>A sample is considered as a set of objects and/or individuals that are being collected by the experimenter from a specific population through a well-defined procedure.