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20 Cards in this Set

  • Front
  • Back
The horizontal, or X, axis of a graph.
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.
Severely skewed distribution with mode at one extreme.
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.
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
∑(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
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