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1. Arrange the data in order from least to greatest 2. Find the median of the set. Data is now split into 2 sections. 3. Find the median of the lower half of the data and the median of the upper half of the data. Data is now split into 4 sections. 4. Identify the lower extreme (the least number) and the upper extreme (the greatest number.) 5. Above or below a number line, graph the 5 identified values. 6. Draw a box around the 3 medians and whiskers to the extremes.

Steps to create a box plot for a set of data

[b]1st Quartile[/b]-the median of the lower half of the data [b]2nd Quartile[/b]-the median of the entire data set [b]3rd Quartile[/b]-the median of the upper half of the data [b]Lower Extreme[/b]-the number with the least value [b]Upper Extreme[/b]-the number with the greatest value [b]Range[/b]-the difference of the upper and lower extremes (the distance from the end of one whisker to the end of the other whisker [b]Interquartile Range[/b]-the difference of the 3rd and 1st quartiles (the width of the box)

Vocabulary

Shows the distribution of the data. The data has been split into 4 equal parts. Therefore, each section represents one-fourth or 25% of the data. Examples of possible interpetations: 75% of the data is larger than the 1st quartile's value 25% of the data is larger than the 3rd quartile's value One-half of the data is smaller than the 2nd quartile's value A whisker may be long due to an outlier A quartile may be narrow due to the data values being close to each other

Interpeting a box plot