Chapter 2 (b)
Popular in Statistics:Understanding and Applying Data
Popular in Department
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.
Reviews for Chapter 2 (b)
Report this Material
What is Karma?
Karma is the currency of StudySoup.
You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!
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
Are you sure you want to buy this material for
You're already Subscribed!
Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'