PSYCH 100A Lecture Notes - Lecture 5: Beck Depression Inventory, Null Hypothesis, Standard Score
Document Summary
Standardized score scales: psychological variables (depression, narcissism) does not have inherent score scales, we make up the metrics, researchers use universal metrics. Iq scale: uses standard score scale with a mean of 100 and standard deviation of 15, the scale is completely made up. Mmpi: minnesota multiphasic personality inventory, widely used test of adult personality and psychopathology. T-scores: many psychological tests use a t-score scale with a mean of 50 and standard deviation of. Z-scores: a common standard score in psychology and statistics that uses a generic scale with a mean of 0 and standard deviation of 1, anything negative is below average. Importance of z-scores: any continuous variable can be converted to a z-score, can be used to describe scores, characterize difference between distributions. Judging z-scores: only if scores are normally distributed (perfect bell curve), 69% of the responses fall within +/- 1 standard deviation of the mean and ~95% are within +/- 2 standard deviations.
