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### 20 Cards in this Set

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 The horizontal, or X, axis of a graph. Abscissa Graph of the frequency distribution of nominal or qualitative data. Bar graph Distribution with two modes. Bimodal distribution A range of scores in a grouped frequency distribution. Class interval Frequency distribution graph of a quantitative variable with frequency points connected by lines. Frequency polygon Compilation of scores into equal-sized ranges (class intervals) plus frequencies within intervals. Grouped frequency distribution Frequency distribution graph of a quantitative variable with frequencies indicated by contiguous vertical bars. Histogram Severely skewed distribution with mode at one extreme. J-curve Graph that shows the relationship between two variables with lines. Line graph A mathematically defined, theoretical distribution or an empirical distribution with a particular bell shape. Normal distribution (normal curve) The vertical, or Y, axis of a graph. Ordinate Score obtained by observation or from an experiment. Raw score Scores arranged from highest to lowest, including each score's frequency. Simple frequency distribution Asymmetrical distribution; may be positive or negative. Skewed distribution The arithmetic average; the sum of the scores divided by the number of scores. x-bar,µ = ∑X/N or ∑fX/N mean ∑(X-Xbar)=0 ∑(X-Xbar)^2=a minimum characteristics of the mean The point that divides a distribution of scores into equal halves, so that half the scores are above it and half are below it. median location=N+1/2 median mode The score that occurs most frequently in a distribution. *median is bigger than the mean *large number of low scores *tale points to the right positively skewed curve *median is smaller than the mean *large number of high scores *tale points to the left negatively skewed curve