http://www.statmethods.net/graphs/images/boxplot1.jpg
Boxplots provide a simple way to illustrate data and are useful for comparing data sets, according to our class notes. The "box" portion is divided at the median, and ends at the 75th percentile at the top, and the 25th percentile at the bottom. The final "whisker" at the top represents the higher end of the data (from the 75th percentile up) and the bottom "whisker" is the lower data (from 25th percentile down.) The above box plot compares mile per gallon use in cars with 4, 6, or 8 cylinders. It appears that the medians are over 25, just below 20 and just above 15 respectively. Below is a sample box plot schematic, for reference.
http://www.dmreview.com/media/assets/article/1033566/Few-fig3_350px.gif
Boxplots provide a simple way to illustrate data and are useful for comparing data sets, according to our class notes. The "box" portion is divided at the median, and ends at the 75th percentile at the top, and the 25th percentile at the bottom. The final "whisker" at the top represents the higher end of the data (from the 75th percentile up) and the bottom "whisker" is the lower data (from 25th percentile down.) The above box plot compares mile per gallon use in cars with 4, 6, or 8 cylinders. It appears that the medians are over 25, just below 20 and just above 15 respectively. Below is a sample box plot schematic, for reference.
http://www.dmreview.com/media/assets/article/1033566/Few-fig3_350px.gif
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