Examlex
What do polls with simple "yes-no" or "agree-disagree" answer options fail to measure? How can pollsters avoid problems associated with questions that ask only for simple "yes-no" or "agree-disagree" answers?
Predictor Variable
An independent variable used in statistical models to predict the outcome or value of another variable.
Treatment Variable
A variable manipulated by an experimenter in a study to observe its effect on the dependent variable.
Reliability
The degree to which an assessment tool produces stable and consistent results over time.
Validity
The extent to which a test or instrument measures what it is intended to measure, indicating the accuracy of the test.
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