  Math Central - mathcentral.uregina.ca  Quandaries & Queries    Q & Q    Topic: box and whisker   start over

5 items are filed under this topic.    Page1/1            A box-and-whisker plot with one whisker 2014-01-09 From Susan:Question from Susan, a teacher: I read your answer to the question about could a box & whisker have NO whiskers. It made sense to me. However I am preparing for my advanced class and I have a sample graph comparing box plots of data. Several of the box have only 1 whisker. There is no explanation for this. Can you help me out. I cannot think of a data set that would produce this. Thanks!Answered by Penny Nom.     Stem-and-leaf plots, box-and-whisker plots and medians 2006-02-21 From A student:explain which plot would be easiest to use to find the median....box-and-whiskers plot or stem-and-leaf plotAnswered by Penny Nom.     Outliers in a box and whisker plot 2006-02-19 From A student:i need help on determining if their is an outlier...i know how to find the median and the lower quartile and the upper quartile..but i don't understand about the outliers....please tell me if their is an outlier in this problem....the numbers are...63,88,89,89,95,98,99,99,100,100Answered by Penny Nom.     Box and Whisker plots 2001-11-19 From Rod:In our Prealgebra course, we have been studying Box and Whisker plots. Recently, we learned how to decide whether a data point is an outlier or not. The book (Math Thematics, McDougall Littell) gave a process by which we find the interquartile range, then multiply by 1.5. We add this number to the upper quartile, and any points above this are considered to be outliers. We also subtract the number from the lower quartile for the same effect. My question: where does this 1.5 originate? Is this the standard for locating outliers, or can we choose any number (that seems reasonable, like 2 or 1.8 for example) to multiply with the Interquartile range? If it is a standard, were outliers simply defined via this process, or did statisticians use empirical evidence to suggest that 1.5 is somehow optimal for deciding whether data points are valid or not? Answered by Penny Nom.     Box and whisker plots 2000-03-09 From Brett Blake:Do you have any information on Box and whisker graphs?Answered by Harley Weston.      Page1/1    Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences.    about math central :: site map :: links :: notre site français