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Hi I need to understand stemplots. thanks
Solution
Stem and Leaf Plot A stem and leaf plot is a way of summarizing a set of data
measured on an interval scale. It is often used in exploratory data analysis to illustrate the major
features of the distribution of the data in a convenient and easily drawn form. A stem and leaf
plot is similar to a histogram but is usually a more informative display for relatively small data
sets (<100 data points). It provides a table as well as a picture of the data and from it we can
readily write down the data in order of magnitude, which is useful for many statistical
procedures. (Definition taken from Valerie J. Easton and John H. McColl's Statistics Glossary
v1.1) Example The following data represent measurements of carbon monoxide content (in mg)
for 25 brands of cigarettes: 13.6, 16.6, 23.5, 10.2, 5.4, 15.0, 9.0, 12.3, 16.3, 15.4, 13.0, 14.4,
10.0, 10.2, 9.5, 1.5, 18.5, 12.6, 17.5, 4.9, 15.9, 8.5, 10.6, 13.9, 14.9. A MINITAB stemplot for
this data (created using the "STEM" command) is shown to the left. MINITAB first truncates
the data by rounding down to integers, then sorts the data. The resulting dataset is the following:
1, 4, 5, 8, 9, 9, 10, 10, 10, 10, 12, 12, 13, 13, 13, 14, 14, 15, 15, 15, 16, 16, 17, 18, 23. The first
column of the MINITAB stemplot counts the number of values from the top down and from the
bottom up to the middle value (the median). The number in parantheses represents the count of
values in the row containing the median, which is the thirteenth ordered value in this example,
13.0. The second column plots the stems, tens of milligrams of carbon monoxide content.
Because the range of the data is small (the values for the stems are 0, 1, and 2), MINITAB
divides the third column, which plots milligrams as leaves, into fifths. In other words, the first
row includes the leaf values 0 and 1, the second row includes the leaf values 2 and 3, etc. Since
there are no values between 1.5 and 4.9, the second row contains no data points. The stemplot
illustrates that the majority of the measurements lie in the teens, with only 6 of the 25 values less
than 10 and only 1 value greater than 20. Data source: Mendenhall, William, and Sincich, Terry
(1992), Statistics for Engineering and the Sciences (3rd ed.), New York: Dellen Publishing Co.
(ISBN: 0 02380552 8) (Original source: Federal Trade Commission, USA) Dataset available
through the JSE Dataset Archive.

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Hi I need to understand stemplots. thanksSolution .pdf

  • 1. Hi I need to understand stemplots. thanks Solution Stem and Leaf Plot A stem and leaf plot is a way of summarizing a set of data measured on an interval scale. It is often used in exploratory data analysis to illustrate the major features of the distribution of the data in a convenient and easily drawn form. A stem and leaf plot is similar to a histogram but is usually a more informative display for relatively small data sets (<100 data points). It provides a table as well as a picture of the data and from it we can readily write down the data in order of magnitude, which is useful for many statistical procedures. (Definition taken from Valerie J. Easton and John H. McColl's Statistics Glossary v1.1) Example The following data represent measurements of carbon monoxide content (in mg) for 25 brands of cigarettes: 13.6, 16.6, 23.5, 10.2, 5.4, 15.0, 9.0, 12.3, 16.3, 15.4, 13.0, 14.4, 10.0, 10.2, 9.5, 1.5, 18.5, 12.6, 17.5, 4.9, 15.9, 8.5, 10.6, 13.9, 14.9. A MINITAB stemplot for this data (created using the "STEM" command) is shown to the left. MINITAB first truncates the data by rounding down to integers, then sorts the data. The resulting dataset is the following: 1, 4, 5, 8, 9, 9, 10, 10, 10, 10, 12, 12, 13, 13, 13, 14, 14, 15, 15, 15, 16, 16, 17, 18, 23. The first column of the MINITAB stemplot counts the number of values from the top down and from the bottom up to the middle value (the median). The number in parantheses represents the count of values in the row containing the median, which is the thirteenth ordered value in this example, 13.0. The second column plots the stems, tens of milligrams of carbon monoxide content. Because the range of the data is small (the values for the stems are 0, 1, and 2), MINITAB divides the third column, which plots milligrams as leaves, into fifths. In other words, the first row includes the leaf values 0 and 1, the second row includes the leaf values 2 and 3, etc. Since there are no values between 1.5 and 4.9, the second row contains no data points. The stemplot illustrates that the majority of the measurements lie in the teens, with only 6 of the 25 values less than 10 and only 1 value greater than 20. Data source: Mendenhall, William, and Sincich, Terry (1992), Statistics for Engineering and the Sciences (3rd ed.), New York: Dellen Publishing Co. (ISBN: 0 02380552 8) (Original source: Federal Trade Commission, USA) Dataset available through the JSE Dataset Archive.