In this video we'll learn about one-sample z tests and one-sample t tests. Along the way we'll also learn about degrees of freedom, the difference between two-tailed (non-directional) and one-tailed (directional) tests, how the t distribution is different than the z distribution, and effect sizes that measure proportion of variance (e.g., eta-squared and omega-squared) rather than standard deviations (as in Cohen's d)