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As Earth rotates, circumpolar stars appear to move counterclockwise around the north celestial pole.
Construct Validity
The degree to which a test measures what it claims, or purports, to be measuring.
Criterion Validity
The extent to which a measure is related to an outcome or criterion that it is supposed to predict.
Internal Consistency Validity
A measure of the reliability of a test or scale, indicating how well the items on the test measure the same construct or concept.
Content Validity
The extent to which a test measures all aspects of the concept or content it intends to measure.
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