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20 Cards in this Set
- Front
- Back
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The horizontal, or X, axis of a graph.
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Abscissa
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Graph of the frequency distribution of nominal or qualitative data.
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Bar graph
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Distribution with two modes.
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Bimodal distribution
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A range of scores in a grouped frequency distribution.
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Class interval
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Frequency distribution graph of a quantitative variable with frequency points connected by lines.
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Frequency polygon
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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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Frequency distribution graph of a quantitative variable with frequencies indicated by contiguous vertical bars.
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Histogram
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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 variables with lines.
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Line 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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The vertical, or Y, axis of a graph.
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Ordinate
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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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Asymmetrical distribution; may be positive or negative.
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Skewed distribution
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The arithmetic average; the sum of the scores divided by the number of scores.
x-bar,µ = ∑X/N or ∑fX/N |
mean
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∑(X-Xbar)=0
∑(X-Xbar)^2=a minimum |
characteristics of the mean
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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
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mode
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The score that occurs most frequently in a distribution.
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*median is bigger than the mean
*large number of low scores *tale points to the right |
positively skewed curve
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*median is smaller than the mean
*large number of high scores *tale points to the left |
negatively skewed curve
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