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What are the two sources of engine contaminants?
Discriminant Validity
The degree to which a measure does not associate too strongly with measures from which it is supposed to differ.
Correlation Coefficient
A statistical measure that quantifies the degree to which two variables vary together; it ranges from -1 to 1, indicating the strength and direction of the relationship.
Scale
A system of ordered marks at fixed intervals used as a reference standard in measurement; in research, it often refers to a set of numbers or descriptors that rate or categorize variables.
Construct Validity
Establishing the extent to which a test accurately represents the concept it's intended to measure, ensuring the theoretical construct is accurately operationalized.
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