PSYCH 2300

• 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

Greek letter "mu"

Is identified by M or X (read x-bar)

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

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• Combining two sets of scores

• 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

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

A distribution with two modes

Distribution with two or more modes

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

• 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

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• Right hand side of the graph is a mirror image of the left side

A distribution that is skewed either + or -