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31 Cards in this Set
- Front
- Back
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score obtained by observation or from an experiment
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raw score
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scores arranged from highest to lowest, including each score's frequency
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simple frequency distribution
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compilation of scores into equal-sized ranges (class intervals) plus frequencies within intervals
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grouped frequency distribution
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a range of scores in a grouped frequency distribution
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class interval
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the horizontal, or X, axis of a graph
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abscissa
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the vertical, or Y, axis
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ordinate
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frequency distribution graph of a quantitative variable with frequency pointws connected by lines
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frequency polygon
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frequency distribution graph of a quantitative variable with frequencies indicated by contigous vertical bars
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histogram
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graph of the frequency distribution of nominal or qualitative data
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bar graph
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a mathematically defined, theoretical distribution or an empirical distribution with a particular bell shape
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normal distribution (normal curve)
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asymmetrical distribution, may be + or -
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skewed distribution
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graph with a great preponderance of low scores
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positive skew
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graph with a great preponderance of large scores
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negative skew
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distribution with two modes
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bimodal distribution
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severely skewed distribution with mode at one extreme
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J-curve
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graph that shows the relationship between two variable with lines
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line graph
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a distribution in which all scores have the same frequency
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rectangular distribution (uniform distribution)
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graph of the frequency distribution of nominal or qualitative data
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bar graph
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descriptive statistics that indicate a typical or representative score
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central tendency
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characterized by having more than one value
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variability
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the arithmetic average the sum of the scores divided by the number of scores
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mean
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point that divides a distribution of scores into equal halves
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median
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score that occurs most frequently in a distribution
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mode
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mean calculated from samples with different N's
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weighted mean
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highest score minus the lowest score
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range
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range of scores that captures the middle 50% of a distribution
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interquartile range
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point below which a specified percentage of the distribution falls
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percentile
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descriptive measure of the dispersion of scores around the mean
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standard deviation
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raw score minus the mean of its distribution
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deviation score
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square of the standard deviation
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sum of the squared deviations from the mean
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sum of the squared deviations from the mean
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sum of squares
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