Numeric Measures

Card Set Information

Author:
chanchan27104
ID:
293105
Filename:
Numeric Measures
Updated:
2015-01-15 16:17:07
Tags:
statistics
Folders:
ST 311
Description:
Gettin' numerical up in this biz
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  1. Why do we use numerical measures?
    • Allows us to make comparisons
    • Gives an idea about the main chunk of the data and where the data is located
  2. Mean-Average Notations
    • Population Mean: μ "mu"
    • Sample Mean: y (y w/line on top) "y-bar"
  3. Median
    Middle value in a data set when values are put in increasing order
  4. In a Box and Whiskers Plot, when it is skewed to the right...
    the mean is greater than the median
  5. In a Box and Whiskers Plot, when it is skewed to the left...
    the mean is less than the median
  6. In a Box and Whiskers Plot, when it is about symmetric....
    the mean and median are about the same
  7. Five Number Summary includes....
    • Minimum
    • Maximum
    • Q1
    • Q3
    • Median
  8. 1st Quartile (Q1)
    value that has 25% of the data below the median
  9. 3rd Quartile (Q3)
    value that has 25% of the data above the median
  10. Boxplots
    • Also called box and whisker plots
    • Presents the 5 number summary in graphical form

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