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35 Cards in this Set

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 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. back-to-back stem-and-leaf chart The back-to-back 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 line-graph 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. stem-and-leaf 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.