Quality of Data - Fundamentals of Psychology - Lecture Notes, Study notes of Introduction to Psychology

Download Quality of Data - Fundamentals of Psychology - Lecture Notes and more Study notes Introduction to Psychology in PDF only on Docsity! Data Analysis Quality of Data Validity – The extent to which the data collected measure the intended variable Error – Effects due to variables other than those measured – NOT just noise or mistakes; includes e.g. variation among individuals – 2 types: Random and Systematic Random Error – Amount is different on each measurement – Tends to average out to zero over time or individuals – Reliability: lack of random error (consistency) Systematic Error – Same effect on every measurement – Does not average out – Produces confounds – Accuracy: lack of systematic error Descriptive Statistics Measures of Central Tendency – Mean – Median – Mode Measures of Variability – Range – Standard Deviation Relationship between two variables; Correlations Scatterplot The correlation coefficient – Strength of relationship (0.0 to ±1.0) – Direction of relationship Positive vs negative correlation – Assumes linear relationships Docsity.com