PSY 230 Lecture Notes - Lecture 5: Random Assignment, External Validity, Covariate
Document Summary
Inferential errors: type i and type ii: type i error, rejecting true null, probability is equal to alpha. Type ii error: failing to reject a false null, probability is beta ( ) Powerful test of the null is more likely to lead us to reject falls nulls than a less powerful test. Powerful tests are more sensitive than less powerful tests to differences between the actual outcome and expected outcome (null hypothesis) Definition: measure of the strength of the relationships between/among variables. Effect size helps us determine if differences are not only statistically significant, but also whether they are important. Power and the role of replication in research. Power increases when we replicate findings in a new study w/ different participants in a different setting. External validity: when findings of a study can be generalized to other populations and settings.
