PSYCH 2300

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Author:
xx.chelsii
ID:
220589
Filename:
PSYCH 2300
Updated:
2013-05-21 20:05:00
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Description:
Frequency Distribution Terms
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  1. Frequency Distribution
    An organized tabulation of the number of individuals located in each category on the scale of measurement
  2. 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
  3. Skewed Distribution
    The scores tend to pile up toward one end of the scale and taper off gradually at the other end
  4. Tail
    The section where the scores taper off toward one end of the distribution
  5. Positively Skewed
    Skewed distribution with the tail on the right hand side; because it points toward the positive (above zero) end on the X-axis
  6. Negatively Skewed
    Skewed distribution with the tail on the left hand side; because it points towards the negative (below zero) end on the X-axis
  7. Range
    Wide range of values
  8. Grouped Frequency Distribution
    Presentation of groups of scores rather than individual
  9. Class Interval
    Groups, or intervals (20-24)
  10. Apparent limits
    • 40-49
    • ...Because it appears that they form the upper and lower boundaries for the class interval
  11. Histogram
    • Used for Interval or Ratio Data
    • Bar graph where the bars touch at the real limits
  12. 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
  13. Bar Graph
    • Used for ordinal and nominal date
    • Bars touch
  14. Relative Frequency
    • When you cannot find an absolute frequency:
    • Shows the relative number
  15. Smooth Curves
    Smooth curve shows the relative changes that occur from one score to another

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