PSY 110 Lecture Notes - Lecture 2: Descriptive Statistics, Standard Deviation, Normal Distribution

• School: University of Miami
• Department: Psychology
• Course: PSY 110
• Professor: Barry Zwibelman

Document Summary

Find this by plugging values in a formula. Random sampling vs. random division (do(cid:374)"t wa(cid:374)t to get a group of all fresh(cid:373)e(cid:374), of all psych majors, etc. : making judgments from data, tests of significance less than 0. 05 is significant. Random sampling start with a random sample to get a sample that is representative. Random division randomly divide participants into at least two random groups. Central tendency all same score if the distribution is normal. Can be skewed left/negative (tail on left) or right/positive (tail on right). When there are outliers, the mean will be changed skew the mean. a. Mean changing one of the outliers will change this, not the median, which is why the median is a better measure of mean when data is skewed. b. Median best measure of average when the data is skewed. Always the 50th percentile: mode most common number, variability, range provides a misleading representation of dispersed scores. b.