Psychology 2061A/B Lecture Notes - Lecture 1: Null Hypothesis, Random Assignment, Internal Consistency

• School: Western University
• Department: Psychology
• Course: Psychology 2061A/B
• Professor: Tara Lee

Document Summary

**more emphasis on lecture material on the tests. Authority (someone said so) rationalization (a priori reasoning) Reality: objects and events are separate from the observer. Causality: human behaviour can be explained by orderly relations. Empirical: objects and events can be observed reliably. Average score on an infinite # of administrations of the same test of parallel versions. Hypothetical difference between an observed score and a true score (error due to measurement) Random errors: vary in unpredictable ways upon repeated measurement. The degree to which observed scores are free from random and systematic errors. Systematic errors: errors that occur upon repeated measurements in a consistent fashion. Carry over effects, reactivity effects, attrition and motivation. A test is valid if it measures what it"s purported to measure. Legitimacy or correctness of inferences that can be drawn form test scores. More difficult to demonstrate validity for more abstract constructs.