Psychological Statistics Chapter 2
Central Tendency -
Typical of most representative value of a group of scores.
Mean -
Arithmetic average of a group of scores; sum of the scores divided by the number of scores.
Mode -
Value with the greatest frequency in a distribution.
Median -
Middle score when all the scores in a distribution are arranged from lowest to highest.
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.
Deviation Score -
Score minus the mean.
Squared Deviation Score -
Square of the difference between a score and the mean.
Sum of Squared Deviations -
