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Central Tendency
 Is a statistical measure to determine a single score that defines the center of a distribution.
 Goal: to find a score that is best representative of a entire group

Population Mean
Greek letter "mu"

Mean for sample
Is identified by M or X (read xbar)

Mean
For a distribution is the sum of the scores divided by the number of scores

Weighted Mean
 Combining two sets of scores

Median
 If the scores in a distribution are listed in order from smallest to largest, the median is the midpoint of the list
 Represented by the word median

Mode
In a frequency distribution, the mode is the score that has the greatest frequency

Bimodal
A distribution with two modes

Multimodal
Distribution with two or more modes

Major/minor Mode
When two modes have unequal frequencies, researchers occasionally differentiate the two values by calling the taller peak the major mode, and the shorter one the minor mode

Line graph
 Point connected with a straight line.
 Line graph is used when the values on the horizontal axis are measured on an interval or ratio scale

Symmetrical Distribution
 Right hand side of the graph is a mirror image of the left side



Skewed Distribution
A distribution that is skewed either + or 

