By Amir Aczel, Jayavel Sounderpandian
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Additional info for Complete Business Statistics, Seventh Edition (The Mcgraw-Hill Irwin Series)
As you can see from the ﬁgure, we now have a more spread-out histogram of the data. The data still seem skewed to the right. If desired, a further reﬁnement of the display is possible by using the symbol * for a stem followed by the leaf values 0 and 1; the symbol t for leaf values 2 and 3; the symbol f for leaf values 4 and 5; s for 6 and 7; and . for 8 and 9. Also, the class containing the median observation is often denoted with its stem value in parentheses. Aczel−Sounderpandian: Complete Business Statistics, Seventh Edition 1.
5 times the interquartile range from the hinge. Let us make these deﬁnitions clearer by using a picture. Figure 1–19 shows the parts of a box plot and how they are deﬁned. The median is marked as a vertical line across the box. The hinges of the box are the upper and lower quartiles (the rightmost and leftmost sides of the box). The interquartile range (IQR) is the distance from the upper quartile to the lower quartile (the length of the box from hinge to hinge): IQR ϭ Q U Ϫ Q L. 5(IQR). The outer fences are deﬁned similarly but are at a distance of 3(IQR) above or below the appropriate hinge.
Draw a box plot for the data in problem 1–47. Are there any outliers? Is the distribution of the data symmetric or skewed? If it is skewed, to what side? 1–49. What are the uses of a stem-and-leaf display? What are the uses of a box plot? 1–50. Worker participation in management is a new concept that involves employees in corporate decision making. The following data are the percentages of employees involved in worker participation programs in a sample of ﬁrms. Draw a stem-and-leaf display of the data.
Complete Business Statistics, Seventh Edition (The Mcgraw-Hill Irwin Series) by Amir Aczel, Jayavel Sounderpandian