Statistical findings can be accurate yet invalid. As a key component to Statistics, our Internal and External Validity topic is designed to increase proficiency in methods, techniques and applications used to determine validity. Discover how the experimenters themselves can inadvertently contaminate data in Experimenter Bias. Explore how the subjects may unintentionally impact experiments in Placebo Effect. Whether the focus is Double Blind Experiments, Evaluating Between Group Designs or Confounding Variables, this course covers a wide range of concepts and methods that apply multiple areas of specialization.