Ch11_Stat110 - Chapter 11 Graphical Displays of...

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Unformatted text preview: Chapter 11 Graphical Displays of Quantitative Data Quantitative Data A quantitative variable takes on numerical values. Ex: height, length, age, SAT score Display the distribution of quantitative variable using histogram and/or stemplot. Stem and Leaf Plot . Stemplot : Used to order small data sets when you want individual values to be maintained. Steps to create a stem and leaf plot Steps to create: 1) Find the minimum and maximum value in the data set. 2) Separate each observation into a stem (all but final digit) and leaf (final digit). 3) Write the stems in a vertical column with the smallest on top. 4) Write each leaf in row next to appropriate stem. Example Create a stem and leaf plot of the following data set. The number of home runs hit by Mark McGwire during the 1982-2001 seasons n = 16 years (out injured some I guess ?) 3,9,9,22,29,32,32,33, 39,39,42,49,52,58,65,70 Minimum Value is 3 Maximum Value is 70 Stems will be in tens starting at 0 Leaf will represent the ones place Stem and Leaf Plot Homeruns of Mark McGwire 1982-2001 0 : 399 1 : 2 : 29 3 : 22399 4 : 29 5 : 28 6 : 5 7 : 0 Legend- 0:3 represent 3 homeruns Split Stem Stem and Leaf PLot Height (in) of Students 5 : 678 6 : 00011222333333344444444 6 : 555555555556666666666666677777777 888888888889999999999999 7 : 000000001111111222222222334444 7 : 5555555667 Legend- 7:5 = 75 inches Split Stems and Back to Back Stems A split stem and leaf plot is good to use when you have a large numbers of...
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Ch11_Stat110 - Chapter 11 Graphical Displays of...

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