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35 Cards in this Set
 Front
 Back
absicssa

The horizontal axis of a distribution.


arithmetic mean

Aithmetic average.


asymmetrical distribution

A distribution of scores in which there is not an exact correspondence in arrangement on the opposite sides of the middle line.


backtoback stemandleaf chart

The backtoback plots of distributions in which the original data are preserved with any desired precision.


bar graph

A graphic form for the distribution of data.


bimodal

Showing two modes (of a distribution).


central tendency

Location of the bulk of a distribution; measured by means, medians, modes, and trimmed means.


corrected range

Crude range plus one unit.


crude range

Highest score minus lowest score.


descriptive measure

Measures such as and that are used to calculate population values.


interquartile range

The difference between the 75th and 25th percentiles.


finite

Describing the condition in which all the units or events can, at least in theory, be completely counted.


frequency distribution

A chart that shows the number of times each score or other unit of observation occurs in a set of scores.


inferential measure

Measures such as S and S that are used to estimate population values based on a sample of values.


infinite

Boundless, or without limits.


standard score (z score)

Score converted to a standard deviation unit.


line graph

A linegraph distribution of frequencies of occurerence.


mean

The arithmetic average of a set of scores.


mean square (S ) or MS

Variance.


median

The midmost score of a distribution.


mode

The score occuring with the greatest frequency.


negatively skewed distribution

An assymmetrical distribution in which the pointed end is toward the left.


ordinate

The vertical axis of a distribution.


outliers

Scores lying far outside the normal range.


percentile

A point in a distribution of scores below which a specified percentage of scores fall.


positively skewed distribution

An asymmetrical distribution in which the pointed end is toward the right.


range

Distance between the highest and lowest score.


root mean square

An index of the variability of a set of daa around the mean values in a distribution.


stemandleaf chart

The plot of a distribution in which the original data are preserved with any desired precision.


standard normal curve

Normal curve with mena = 0 and = 1


symmetrical distribution

A distribution of scores in which there is an exacts correspondence in arrangementon the opposite sides of the middle line.


transformation

Conversion of data to another mathematical form


trimmed mean

The mean of a distribution from which a specified highest and lowest percentage of scores has been dropped.


unbiased estimator of the population of

A specific statistic usually written as S


variance

The mean ofd the squared deviations of scores from their means in a population or its unbiased estimate.
