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Chapter 2 (b)

by: Jonathan Femi-Cole

Chapter 2 (b) PSTL1004

Marketplace > PSTL1004 > Chapter 2 b
Jonathan Femi-Cole

GPA 3.2

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measure of center and variation and standard variation
Statistics:Understanding and Applying Data
Suzanne Loch
Class Notes
Math, Statistics
25 ?




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This 2 page Class Notes was uploaded by Jonathan Femi-Cole on Monday February 15, 2016. The Class Notes belongs to PSTL1004 at a university taught by Suzanne Loch in Winter 2016. Since its upload, it has received 17 views.


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Date Created: 02/15/16
Three questions of numerical data  Shape – what shape does the distribution have?  Center – what is a typical answer to this question?  Spread or variability – how different are the answers to the question? Measure of Center 1 Median - Middle of the number set (distribution) 2 Mean - Balance point of the number set (distribution) Mean = Ex. y= all the numbers added on the y axis y= 3, 4, 5, 6, 7 y=25 Which measure to use  If the histogram is symmetric and there are no outliers, use the mean.  if the histogram is skewed or with outliers, you are better off with the median. Measures of Variation  Range – overall variability  Interquartile Range – spread of the middle half of the data  Standard Deviation – average distance of the data points to the mean y y­mean (y­mean)² 3 4 5 6 7 25  y-mean o numbers in the standard deviation and the mean  (y-mean)^2 o plug in y-mean


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