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

Video Links

Type I Errors, Type II Errors, and the Power of the Test
Description: This YouTube video discusses power and the types of error in hypothesis testing.

How to Calculate Cohen's d 
Description: This YouTube video detailing how to calculate and interpret the effect size for t tests using Cohen’s d.

Part I

Part II

Description: This YouTube video tutorial (2-part) conducts chi-square analysis and calculating Cramer’s V on example data in SPSS.

Audio Links

Null Hypothesis Testing 
Description: This audio discusses probability, null hypothesis testing including what constitutes a correct decision, a Type I error, and a Type II error. It discusses p values, their meaning and interpretation, and the relationship between p values, alpha and Type I errors. It also discusses how p value relates to statistical significance and to marginally significant p values.

Power and Effect Size
Description: This audio discusses relationship between Type II errors, beta, and power. Included in the discussion of power are the ways of increasing power and the advantages and disadvantages of each method. It concludes with a discussion of effect size, what it means and the relationship between power, effect size, and sample size.

Web Resources:

Null Hypothesis Definition
Description: Four-part description of null hypotheses

Choosing Between Nonparametric or Parametric Tests 
Description: Describes nonparametric and parametric tests and under which circumstances you would use each one

Understanding Confidence Intervals and Effect Size Estimation
Description: Association for Psychological Science article describes CIs and effect sizes