Chapter_3_Statistics

Chapter_3_Statistics - Chapter 3 The Shape of Distributions...

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Chapter 3 The Shape of Distributions Chapter Outline - The Basic Elements - Beyond the Basics: Comparisons and Conclusions - A Special Curve The Basic Elements - Gives the Example of Test Scores and two different ways to represent them o First is a bar graph or histogram o A bar graph is particularly useful when the values or scores you want to represent fall into the category of nominal or ordinal data o It gives the example of information presented as letter grades o Second is a Frequency distribution Graph o A frequency Distribution is a table or graph that indicates how many times a value or score appears in a set of values or scores o In the example of test grades this could be used for actual numerical test scores not just letter grades Three important elements of frequency distribution are an x axis a y axis and a frequency curve (the area under the curve are the cases you are representing) Beyond the Basics: Comparisons and Conclusions - Various curves can represent two distributions with the same standard deviation but very different mean values - o The above graph is an example of symmetrical distributions - a line can be placed through the center of the distribution and the two halves will be mirror images
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This note was uploaded on 07/12/2010 for the course MIS 311 taught by Professor Cleveland during the Spring '10 term at University of Texas.

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Chapter_3_Statistics - Chapter 3 The Shape of Distributions...

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