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Displaying & Analyzing Data. Stem-and-leaf Plot. Stem-and-Leaf Plots. Stem-and-Leaf Plots: A convenient method to display every piece of data by showing the digits of each number. Stem-and-Leaf Plots. In a stem-and-leaf plot, the greatest common place value of the data is used to form stems.
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Displaying & Analyzing Data Stem-and-leaf Plot
Stem-and-Leaf Plots • Stem-and-Leaf Plots: A convenient method to display every piece of data by showing the digits of each number.
Stem-and-Leaf Plots • In a stem-and-leaf plot, the greatest common place value of the data is used to form stems. • The numbers in the next greatest place value position are then used to form the leaves.
Age of United states Presidents at their First Inauguration: 57 61 57 57 58 57 61 54 68 51 49 64 50 48 65 52 56 46 54 49 50 47 55 54 42 51 56 55 51 54 51 60 62 43 55 56 61 52 69 64 (Through the 40th presidency) Stem Leaf 9 8 6 9 7 2 3 4 5 6 7 7 7 8 7 4 1 0 2 6 4 0 5 4 1 6 5 1 4 1 5 6 2 1 1 8 4 5 0 2 1 9 4
Statistics: Stem-and-Leaf Plots Age of United states Presidents at their First Inauguration: 57 61 57 57 58 57 61 54 68 51 49 64 50 48 65 52 56 46 54 49 50 47 55 54 42 51 56 55 51 54 51 60 62 43 55 56 61 52 69 64 (Through the 40th presidency) Rearrange the leaf in numerical order from least to greatest Stem Leaf 4 5 6 2 3 6 7 8 9 9 0 0 1 1 1 1 2 2 4 4 4 4 5 5 5 6 6 6 7 7 7 7 8 0 1 1 1 2 4 4 5 8 9
Statistics: Stem-and-Leaf Plots • It is easy to interpret or analyze information from the Stem-and-Leaf. • How many presidents were 51 years old at their inauguration? • What age is the youngest president to be inaugurated? • What is the age of the oldest president to be inaugurated? • How many presidents were 40-49 years old at their inauguration? 4 42 69 7 Stem Leaf: Age of United States Presidents at their First Inauguration (through the 40th Presidency) 4 5 6 2 3 6 7 8 9 9 0 0 1 1 1 1 2 2 4 4 4 4 5 5 5 6 6 6 7 7 7 7 8 0 1 1 1 2 4 4 5 8 9
Data Displays A box-and-whisker plot shows how data is distributed by using the median, upper and lower quartiles, and the greatest and least values in the data set.
17, 18, 19, 21, 24,26, 27 The lower quartile (LQ) is the median of the lower half of the data. The LQ is 18. The upper quartile (UQ) is the median of the upper half of the data. The UQ is 26. ___ __ 16 17 18 19 20 21 22 23 24 25 26 27 28
Make a Box & Whisker Plot 76, 78, 82, 87, 88, 88, 89, 90, 91, 95 88 Find the median of this segment (LQ) Find the median of this segment. LQ = 82 UQ = 90
Lower Quartile (LQ) Middle Quartile Least Value Upper Quartile Greatest Value 76, 78, 82, 87, 88, 88, 89, 90, 91, 95 75 80 85 70 105 90 100 95 65 Now for the box and whisker
Lower Quartile (LQ) Middle Quartile Least Value Upper Quartile Greatest Value 76, 78, 82, 87, 88, 88, 89, 90, 91, 95 75 80 85 70 105 90 100 95 65 What number represents 25% of the data? LQ 82 What number represents 50% of the data? Median 88 What number represents 75% of the data? UQ 90
Stem and Leaf Plot • Stem and leaf plots are used as a quick way of seeing how many pieces of data fall in various ranges. The reader can quickly tell: - the range - the mode • Stem and leaf plots have a title, a stem, and leaves • A key is used to explain how to read the stem and leaves.
Box - and - Whisker Plot • Displays large set of data. • Labeled Intervals • Gives general idea of how data clusters. • Box between lower and upper quartiles • Whiskers from quartiles to extremes • Graph includes: • Title • Median, Quartiles, Minimum and Maximum
Displaying & Analyzing Data Stem-and-leaf Plot Box-and-Whisker Plot Venn Diagrams
