Watch and learn! Carefully selected videos will help bring key concepts and theories to life, preparing you for your studies and exams.

Click on the following links which will open in a new window.

Audio Links

• 4.1: Measurement Validity

• 4.2: Reliability: This American Life 436: The Psychopath Test

Video Links

• Different Levels of Measurement
  A clear and engaging description and illustration of the different levels of measurement (Nominal, Ordinal and Interval/Ratio).

• Reliability and Validity
  A discussion of reliability and validity and their interrelationship.