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How can you use a box and whisker plot to describe test scores?
Wiki User
∙ 13y ago
You need to find the median first. That will divide the data into two halves.
The median is also known as Q2 or second quartile.
Now take the first half of you data and find the median of that half.
This is known as Q1. Do the same with the second half and that is Q3.
You box has Q1 on the left, Q3 on the right and Q2 in the middle.
The whiskers will be the range of your data, that is to say the upper and lower extremes. You will graph the quartiles and the extremes with the scale underneath them. A link with pictures is provided.
The 5 numbers, Q1, Q2, Q3 and the extremes(max and min values) are known as the 5 number summary.
Wiki User
∙ 13y ago
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Stem-and-leaf plot
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