In this video I cover descriptive statistics and three measures of central tendency; the mean, median, and mode. The calculation of each is explained, as well as potential problems, such as the mean’s sensitivity to extreme scores, especially in small … Read More
The Experimental Method
In this video I explain the experimental method and how the combination of manipulation and random assignment can help to eliminate the third variable problem. I also explain why random assignment helps avoid self-selection and bias so that we can … Read More
The Third Variable Problem
In this video I explain the third variable problem in correlational studies, how matched samples and matched pairs can be used to eliminate a possible third variable, and why measurement alone can never truly solve the third variable problem. Don’t … Read More
Real and Illusory Correlations, Scatterplots, and Causation
In this video I explain the dangers of illusory correlations and confirmation bias, correlational studies, patterns of variation, r-values, scatterplots and conclusions about causation. Try guessing the r-value from a scatterplot at www.guessthecorrelation.com Don’t forget to subscribe to the channel … Read More
Populations and Samples
In this video I explain populations and samples, including random sampling, opportunity samples, stratified sampling, and issues related to representativeness. Don’t forget to subscribe to the channel to see future videos! Have questions or topics you’d like to see covered … Read More
Case Studies and the Survey Method
In this video I explain case studies and the survey method, providing explanations of the advantages and disadvantages of each approach, such as applicability, issues with framing, and reporting bias. Don’t forget to subscribe to the channel to see future … Read More
Operational Definitions and Construct Validity
In this video, I cover properties, operational definitions, and construct validity. Understanding these concepts is fundamental for determining which conclusions can be drawn from a study and should always be kept in mind when considering interpretations of research. Don’t forget … Read More
Observer Bias: Clever Horses and Dull Rats
In this video, I explain two well-known examples of observer bias: the case of Clever Hans, and Rosenthal and Fode’s experiment with “bright” and “dull” rats. Observer bias (or experimenter expectancy effect) is considered, along with an explanation for how … Read More
The Scientific Mindset: Skepticism and Humility
In this video I discuss the role of skepticism and humility in thinking about scientific research and evaluating claims. I also mention the supposed “crisis of confidence” in psychology, the problem with pseudosciences, and the role that data plays in … Read More
Difficulties of Psychological Research
In this video I discuss three difficulties of conducting psychology research: complexity, variability, and reactivity. I also explain demand characteristics, social desirability, and the Hawthorne Effect. Don’t forget to subscribe to the channel to see future videos! Have questions or … Read More