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15 Cards in this Set
- Front
- Back
Frequency distribution
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An organized tabulation of the number of individuals located in each category on the scale of measurement
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What do the X values represent in a frequency distribution table?
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The scale of measurement; not the actual set of scores
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Relative frequencies
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Refer to populations
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What are histograms used for?
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Continuous variables
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What two graphs can be constructed using a frequency distribution graph?
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Histograms and polygons
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distribution =
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Frequency distribution graph
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Three characteristics that completely describe any distribution:
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Shape, central tendency, and variability
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Symmetrical distribution
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It is possible to draw a vertical line through the middle so that one side of the distribution is a mirror image of the other
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Skewed distribution
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The score tends to pile up toward one end of the scale and taper off gradually at the other end
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Tail
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The section where the scores taper off
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Positively skewed
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The tail is on the right hand side
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Negatively skewed
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The tail points to the left
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Histograms and polygons
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Used for interval and ratio data
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Bar graphs
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Used for nominal or ordinal data
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Relative frequencies and smooth curves
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Used for population distributions
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