Reduce the fraction to lowest terms by first factoring the numerator and denominator into the product of prime factors and then dividing out any factors they have in common. 
Definitions:
Test-retest Reliability
The degree to which the same test or assessment yields consistent results over time when taken by the same individual under the same conditions.
External Validity
The extent to which the results of a study can be generalized to other situations and to other people.
Interrater Reliability
A measure of how consistently different observers or raters assess, score, or judge a particular trait, behavior, or outcome.
Placebo
A harmless pill, medicine, or procedure prescribed more for the psychological benefit to the patient than for any physiological effect.
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