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15 Cards in this Set

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