PSY 102 Lecture Notes - Lecture 4: Unconscious Mind, Standard Deviation

• School: Ryerson University
• Department: Psychology
• Course: PSY 102
• Professor: Kristin Vickers

Document Summary

Double-blind study (subject shouldn"t know what group they are in, researcher doesn"t know what the hypothesis either) There are two types of statistics: descriptive statistics: describes the characteristics of your data. Mean: adding up all numbers and dividing by number of data (must be careful of outliers) Median: the middle of set of data ii) iii) Variability refers to how much scores spread out from the mean ex: 60,50,70,60 mean 60 and 90,30,40,80 mean 60 (high variability) Range: subtract the lowest value from the highest (doesn"t show variability) Standard deviation: measures the average spread of scores from the mean. It takes into account of all scores in the distribution and not just the highest and lowest. The greater the variability, the higher standard deviation. It provides a precise way of determining how people compare to one another. In an ideal normal distribution, mean mode and median are the same, and the graph is always symmetrical: inferential statistics.