Variables, Validity, and Control

  • Reliability

    The headless professor discusses the concept of reliability and some of the more common types of reliability measures. He presents a 2 x 2 contingency table to demonstrate reliability as having more agreements than disagreements. What do measures of reliability determine? Why did the headless professor present the 2 x 2 table to explain reliability? How is reliability defined in…

    Read More »
  • Validity

    The headless professor defines validity and how it is established by way of a 2 x 2 contingency table. He also discusses different types of validity such that in clinical psychology (diagnosis and prognosis) and industrial/organizational psychology (performance). Define validity in your own words. Why is it important to establish validity in clinical psychology and industrial/organizational psychology? Why did the…

    Read More »
  • Samples

    The headless professor explains the difference between subjects (participants), groups, samples, and populations. He offers a clinical example and a marketing one, and provides a diagram showing the relationship between a population, group, sample, and participants. What is the difference between subjects/participants, groups, samples, and populations? Develop a research question. Are you able to identify your participants, relevant groups, secure…

    Read More »
  • Placebo Effect Video from Emma Bryce

    Comedians Penn and Teller expose medical scam artists by using outrageous fake medical equipment and a fictitious doctor in a shopping mall. People tried magnet therapy, chiropractic weighted coats, and a snail mucus mask and were asked whether they experienced any health benefits. Unfortunately, this video was removed by the corporate owner (CBS). We found another great video for your…

    Read More »
Close