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Frequency Distribution
An organized tabulation of the number of individuals located in each category on the scale of measurement

Symmetrical Distribution
In a , it is possible to draw a vertical line through through the middle so that one side of the distribution is a mirror image of the other

Skewed Distribution
The scores tend 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 toward one end of the distribution

Positively Skewed
Skewed distribution with the tail on the right hand side; because it points toward the positive (above zero) end on the Xaxis

Negatively Skewed
Skewed distribution with the tail on the left hand side; because it points towards the negative (below zero) end on the Xaxis

Range
Wide range of values

Grouped Frequency Distribution
Presentation of groups of scores rather than individual

Class Interval
Groups, or intervals (2024)

Apparent limits
 4049
 ...Because it appears that they form the upper and lower boundaries for the class interval

Histogram
 Used for Interval or Ratio Data
 Bar graph where the bars touch at the real limits

Polygon
 Used for Interval or Ratio Data
 Dots places at the midpoints
 For finding a midpoint of a class interval:
 20 + 29 49
  =  = 24.5
 2 2

Bar Graph
 Used for ordinal and nominal date
 Bars touch

Relative Frequency
 When you cannot find an absolute frequency:
 Shows the relative number

Smooth Curves
Smooth curve shows the relative changes that occur from one score to another

