The two-sided stem-and-leaf plot below shows the number of home runs hit by the members of 2 major league baseball teams. The mode for the ages of the female customers was 29 years of age. In other words, for the males found to be at the store in the first half hour of opening day, there was no real age category where a concentration of males could be found.įor the female customers, the ages ranged from 15 to 72, but they were concentrated between 21 and 48. The ages for the male customers were spread out throughout this range, with the mode being age 35. Compare the distributions.įor the male customers, the ages ranged from 10 to 72. The M's in the data represent males, and the F's represent females.Ĭonstruct a back-to-back stem-and-leaf plot showing the ages of male customers and the ages of female customers. The data represents the ages of people who entered into a new hardware store within its first half hour of opening on its opening weekend. The following data was collected in a survey done by Connor and Scott for their statistics project. It would seem that the 2009 class had, indeed, done slightly better than Mrs. The mode for the 2009 class was 76, but for the 2010 class, it was 74. In 2010, the class marks ranged from 70 to 100. In 2009, her class had marks anywhere from 76 to 95. There is a wide variation in the marks for both years in Mrs. Construct a two-sided stem-and-leaf plot for the data and compare the distributions. She recently wrote down the class marks for her current grade 12 class and compared it to the previous grade 12 class. Cameron teaches AP Statistics at GHI High School. Tf := ListTools:-Occurrences( true, (x->type(x,negative))~(LeafStemTable)) StemPlot := proc( datatable:: įor i from min( LeafStemIndices ) to max( LeafStemIndices ) do You can copy this code and use it to make your own plots. The leaves are listed in increasing order on the right of the line with any repeated values included.Ī procedure for generating stem-and-leaf displays is included in the following code edit region. The stems are listed to the left of the line and each stem is only listed once. The stem-and-leaf display is visually separated into two columns separated by a vertical line. After this number of observations, other plots such as histograms or box plots may be more useful in giving an overview of the shape of the distribution. Stem-and-leaf displays are generally only useful for smaller data samples as they tend to appear cluttered and unreadable starting at around 150 observations or more. Similar to histograms, these plots are useful for displaying an overview of the relative density of the data and can be efficient for highlighting outlying values and finding the mode of the sample. The stem-and-leaf display assists in visualizing the overall shape of a distribution of data.
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