Click on the following links. Please note these will open in a new window.

Video Links

• 1936 Election: Biased Sampling Procedure 
  YouTube video illustrates the sampling bias, despite a large sample size, involved in the historical election poll of 1936
• T-Test 
  YouTube video that defines the t-test within inferential statistics and explains through research examples its use and interpretation
• Sampling: Simple Random, Convenience, Systematic, Cluster, Stratified 
  This YouTube video describes simple random, convenience, systematic, cluster, and stratified sampling and provides a visual illustration of each

Audio Links

• Lack of Diversity in Clinical Trials Presents Possible Health Consequences                               
  This NPR audio clip discusses how racial minorities are not well represented in clinical trials, why this is problematic, and some barriers to achieving diversity in study samples.                   
• When Drawing Districts, Should States Count Each Person or Each Voter? 
  This NPR audio clip discusses how legislative districts are based on equality of total population, rather than eligible or registered voters. Discusses sampling and the voter population in the U.S.
• Most E-Cigarette Users are Current and Ex-Smokers, Not Newbies
  This NPR audio clip describes a recent research study that surveyed adults about e-cigarettes and how different groups and individuals interpret the results

Web Resources

• Populations and Sampling   
  Provides overview of populations, samples, and sampling techniques
• Types of Samples 
  This website from University of California Davis describes types of samples, examples of nonprobability samples, and contains links to self-tests on the concepts
• Participant Pool 
  This website from James Madison University’s Department of Psychology gives an example of how undergraduate students sign up to be part of a participant pool