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I personally hated these. So say you have a set of numbers. 78, 80, 81, 83 ,and 85.
You need to find the lower quartile, upper quartile, and of course median. the highest and lowest points will be on the end. draw a box around the upper, and lower quartile and lines coming out from it connecting to 78 and 85.
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Rafa
Ezrayou must have the cumulative frequency and calculate the upper and lower quartiles.
Firstly, you must (from a set of data,) find the highest and lowest value, on a number line, plot these down using a short line. Next plot your median, upper and lower quartile range, plot these on using a larger line and join the lines up to form a box plot. You are now done!
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When do you use a box-plot?
A box plot may be used at a preliminary stage to determine the centre and spread of a set of data. The box [and whiskers] plot measures the central point by the median and the range from the maximum and minimum or the quartile points.
Is a stem and leaf plot the same as a box and whiskers plot?
No, they are two different things. Mainly because the Box And Whisker Plot has a different technique and focuses on highs and lows. The Stem and Leaf Plot has to do with key codes, grouping numbers, and amounts.
How can you tell if data is skewed on a box plot?
If the median is exactly in the middle of the box, and the box is exactly in the middle of the whiskers, then skewness = 0. The data are skewed if either the median is off-centre in the box, or if the box is off-centre overall.
What is the range of the data set in the box and whisker plot?
The whiskers go from the minimum to the maximum though outliers may be excluded. The box, itself, goes from the lower quartile to the upper quartile.
What is the purpose in a box and whisker plot?
A box and whiskers plot is a very simple way off showing summary information for a set of data. This can allow some quick analyses of the location and spread of data and permit simple comparisons between sets of data.
