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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
