PSYCHOLOGY'S STATISTICS

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Mode
The most frequently occurring score or scores in a distribution.
Mean
The arithmetic average of a distribution
Median
The middle score in a ranked distribution
Range
The difference between the highest and the lowest scores in a distribution.
Standard Deviation
A computed measure of how much scores vary around the mean score of a distribution.
Normal Distribution
A frequency distribution that is shaped like a symmetrical bell.
Correlation Coefficient
A statistical measure of the strength of the relationship between two variables.
Positive Correlation
As the value of one variable increases (or decreases), the value of the other variable increases (or decreases). A perfect positive correlation is +1.0.
Negative Correlation
As the value of one variable increases, the value of the other variable decreases.
A perfect negative correlation if -1.0.
Zero Correlation
There is no relationship whatsoever between the two variables.
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