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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 equal-sized 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 J-curve 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