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31 Cards in this Set
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 Back
score obtained by observation or from an experiment

raw score

scores arranged from highest to lowest, including each score's frequency

simple frequency distribution

compilation of scores into equalsized ranges (class intervals) plus frequencies within intervals

grouped frequency distribution

a range of scores in a grouped frequency distribution

class interval

the horizontal, or X, axis of a graph

abscissa

the vertical, or Y, axis

ordinate

frequency distribution graph of a quantitative variable with frequency pointws connected by lines

frequency polygon

frequency distribution graph of a quantitative variable with frequencies indicated by contigous vertical bars

histogram

graph of the frequency distribution of nominal or qualitative data

bar graph

a mathematically defined, theoretical distribution or an empirical distribution with a particular bell shape

normal distribution (normal curve)

asymmetrical distribution, may be + or 

skewed distribution

graph with a great preponderance of low scores

positive skew

graph with a great preponderance of large scores

negative skew

distribution with two modes

bimodal distribution

severely skewed distribution with mode at one extreme

Jcurve

graph that shows the relationship between two variable with lines

line graph

a distribution in which all scores have the same frequency

rectangular distribution (uniform distribution)

graph of the frequency distribution of nominal or qualitative data

bar graph

descriptive statistics that indicate a typical or representative score

central tendency

characterized by having more than one value

variability

the arithmetic average the sum of the scores divided by the number of scores

mean

point that divides a distribution of scores into equal halves

median

score that occurs most frequently in a distribution

mode

mean calculated from samples with different N's

weighted mean

highest score minus the lowest score

range

range of scores that captures the middle 50% of a distribution

interquartile range

point below which a specified percentage of the distribution falls

percentile

descriptive measure of the dispersion of scores around the mean

standard deviation

raw score minus the mean of its distribution

deviation score

square of the standard deviation

sum of the squared deviations from the mean

sum of the squared deviations from the mean

sum of squares
