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Video

Reliability versus Validity
This video distinguishes between reliability and validity. 

Scales of Measurement: Nominal, Ordinal, Interval, and Ratio Scale
This video explains various scales of measurement.

Audio

Buyers Dissatisfied With Car Technology, Reliability Study Says
This audio clip centers on a reliability study applied to car technology.

Web

Reliability and Validity
This brief article distinguishes between reliability and validity.