The most frequently occurring score or scores in a distribution.
The arithmetic average of a distribution
The middle score in a ranked distribution
The difference between the highest and the lowest scores in a distribution.
A computed measure of how much scores vary around the mean score of a distribution.
A frequency distribution that is shaped like a symmetrical bell.
A statistical measure of the strength of the relationship between two variables.
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.
As the value of one variable increases, the value of the other variable decreases.
A perfect negative correlation if -1.0.
There is no relationship whatsoever between the two variables.
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