PS101 Lecture Notes - Standard Deviation, Null Hypothesis, David H. Hubel
Document Summary
Human brain cannot comprehend numbers larger than 100,00. Descriptive stats: skewed distribution, measuring variability, standard deviation. 15 questions from last 2 chapters: bell shaped. For psychological tests standard deviation is the unit of measurement. Measuring correlation: coefficient, magnitude 0 +- 1, closer relationship to 1. Hypothesis testing: use sample to test, do not expect anything prior to opposite, start with null hypothesis, statistical significance. Sense-light first hitting the eye, sound first hitting our ear first. Psychophysics: eyes can detect a candle at approx 2 km-threshold, weber"s law, everyone clapping and one more person joins- unnoticeable, one person clapping and one person joins-noticeable, 30 ounces notice 1 more ounce. 1/30 noticeable: pg 133, concepts and issues, signal detection theory-decision and sensation. Party-expecting to know people more likely to hear name called. Not knowing anyone-less likely to hear named called: sensory adaptation.
