PSY 102 Lecture Notes - Lecture 3: Internal Validity, Blind Experiment, Descriptive Statistics
9 Feb 2016
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Document Summary
We want to avoid subjective impressions at all costs (be objective as possible, test ideas) They reduce the cognitive energy required to solve problems and work 9 times out of 10. The problem is when they oversimplify reality. Heuristics allow us to assume that sarah is probably a holistic healer considering that she loves new age music, attends spiritual classes and does yoga, when in reality she is a teacher. Judging the probability of an event by its supericial similarity to a prototype. It"s a guess based on stereotypes (judging a book by its cover) Usually works but only if we consider base rates (which we don"t often do) Base rate: how common a behaviour or characteristic is in the population. Base rate fallacy: neglecting to consider base rates. Perception of a statistical association where none exists. Some people associate the full moon where a lot of crime happens.
