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Video Clips

• Sampling Population and Generalizability 
  How samples and populations differ and how it affects the generalizability of results.

• Sampling Error and Sample Size 
  A review of sample size and sample error.

Audio Clips

• What Might Make Young People Practice Safe Sex?  Lottery Tickets! 
  An example of recruiting participants to answer an important research question.

• Buying Experiences, Not Things, May Increase Happiness 
  Psychologists reported feelings happier when they spent their money on experiences rather than buying material objects.