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Chapter IV Terms
Range the simplest measure of dispersion; the distance between the largest and
smallest scores.
Semiinterquartile range is onehalf the distance between the first quartile point,
and the third quartile point.
Percentile point is a point on the measurement scale below which a specified
percentage of scores falls.
Percentile rank refers to the percentage of scores that falls below the percentile
point.
Standard deviation is the most important and most widely used measure of
dispersion. A number that is based on every score in a distribution and represents
the square root of the mean squared distance of scores form the mean.
Deviation formula the formula for S because the formula involves the computation
of deviations.
Rawscore formula similar to the deviation formula but it eliminates the rounding
error.
Coefficient of variation is used when you want to compare the dispersions of two
distributions with markedly different means.
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This note was uploaded on 04/13/2008 for the course PSY 2405 taught by Professor Kirk during the Spring '08 term at Baylor.
 Spring '08
 kirk

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