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Box-and-Whisker Plots

Learn how to create and analyze box-and-whisker plots with step-by-step instructions. Understand key vocabulary and concepts such as median, upper quartile, lower quartile, and inter-quartile range. Complete practice exercises and watch a video tutorial.

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Box-and-Whisker Plots

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  1. Box-and-Whisker Plots

  2. Box-and-Whisker Plot Vocabulary • Median – The middle number of a set of data. • Upper Quartile – The median of the data values that are greater than the median of the total data set. • Lower Quartile – The median of the data values that are less than the median of the total data set. • Upper/Lower Extreme – The highest and lowest numbers in a set of data.

  3. Box-and-Whisker Plot Practice Make a box-and-whisker plot using the following set of data: 1, 6, 10, 4, 2, 8, 15, 6, 3 Step #1: Put the numbers in order from least to greatest: 1, 2, 3, 4, 6, 6, 8, 10, 15 Step #2: Create a number line…that extends beyond the upper/lower extremes. Step #3: Find the Median…draw a line above the median on the number line. Step #4: Find the Upper Quartile…draw a line above the upper quartile. Step #5: Find the Lower Quartile…draw a line above the lower quartile. Step #6: Create a box (a rectangle) above the number line with the upper and lower quartiles as two of the sides. Step #7: Create whiskers (straight lines) that extend from the box to the upper and lower extremes.

  4. Box-and-Whisker Plot Practice There are 12 people are in a Habanera Pepper eating contest who ate the following amount of peppers: 4, 4, 4, 9, 15, 2, 5, 0, 10, 12, 1, 18 Put the numbers in order from least to greatest: 0, 1, 2, 4, 4, 4, 5, 9, 10, 12, 15, 18 BELOW THE MEDIAN (4.5) ABOVE THE MEDIAN (4.5) Discussion Question: Why are all of the Boxes and Whiskers different sizes?

  5. _____% _____% _____% _____% Analyzing a Box-and-Whisker Plot 25% 25% 25% 25% 50% 50%

  6. Box-and-Whisker Plot Reflection Question • Kyle believes that the reason that the boxes and whiskers are not always the same size is because there are more numbers in some of the boxes than others. Is he correct? Explain in complete sentences.

  7. How to find the: Inter-Quartile Range • Inter-Quartile Range – the difference between the upper and lower quartile of a set of data. • Inter-Quartile Range = Upper Quartile – Lower Quartile Show where you could find the inter-quartile range on the box-and-whisker plot below: INTER-QUARTILE RANGE

  8. Colby graphed some data as shown in this box-and-whisker plot. • The range of the data is 25. • One-half of the data is below 65. • The median of the data is 60. • Three-fourths of the data is below 90. Which statement is true about Colby’s data?

  9. Which of the following is not true about the box-and-whisker plot shown below? • The inter-quartile range is 8 • The upper quartile is -2. • The median of the data is 1. • The lower extreme is -9.

  10. Box and Whisker Video https://www.youtube.com/watch?v=UE_NSjgMOBQ

  11. Homework Workbook page 100 (1-9)

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