PSY 201 Chapter Notes - Chapter 2: Central Tendency, Squared Deviations From The Mean, Standard Deviation

• School: Stony Brook University
• Department: Psychology
• Course: PSY 201
• Professor: Antonio Freitas

Document Summary

Central tendency - refers to the middle of the group of scores in a distribution. Mean - arithmetic average of a group of scores; sum of the scores divided by the number of scores. Divide this sum by the number of scores. Mode - value with the greatest frequency in a distribution. Median - the middle score when all the scores in a distribution are arranged from lowest to highest. Line up all the scores from lowest to highest. Figure how many scores there are to the middle score by adding 1 to the number of scores and dividing by 2. Count up to the middle score or scores. Outlier - score with an extreme value (very high or very low) in relation to the other scores in the distribution. Variance - measure of how spread out a set of scores are; average of the squared deviations from the mean.