Take Note Key Concept: Box-and-Whisker Plot

Problem 4 Using a Box-and-Whisker Plot

How can you use a graphing calculator box-and-whisker plot to find quartiles for the water temperature data of St. Petersburg from Problem 3?

• Step 1 For St. Petersburg, use STAT EDIT to enter the temperature data in L1.

• Step 2 In STAT PLOT, select a box-and-whisker plot. Enter L1 for the St. Petersburg data.

  Enter the window values. Draw the box-and-whisker plot.

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• Step 3 Use TRACE to find the quartiles: Q 1 = 66 , Q 2 = 76 , q sub 1 , equals 66 comma , q sub 2 , equals 76 comma  and Q 3 = 84 . q sub 3 , equals 84 .

✓ Got It?

4. 1. How can you use graphing calculator box-and-whisker plots to find water temperature quartiles for other Gulf Coast sites in Problem 3?
   2. Reasoning Is a box-and-whisker plot a useful graphical display for data with an outlier? Explain.