Quartiles divide the data set into four equal parts. Extend the “right whisker” to the maximum value. Draw a box plot for this information. A box-and-whisker plot is one way to represent the data visually. Extend the “left whisker” to the minimum value. (Total for question 1 is 2 marks) Minimum Lower Quartile Median Upper Quartile Maximum 11 28 37 42 51 2 The table shows some information about the weights, in grams, of some potatoes. Page 2 of 6 Reference the picture below to see how a data set is separated into halves. Example 2: Use data set from Example 1 to calculate the minimum, LQ, UQ, maximum, range, and IQR. shown at the right. Show all 4 steps and work neatly below. ! 6. These are the mimimum, Q1, Median, Q 3, and maximum values. The box plots show the distribution of the number of team wristbands sold daily by two different stores over the same time period. a. 282 Chapter 7 Data Analysis and Displays 7.2 Lesson Lesson Tutorials Key Vocabulary box-and-whisker plot, p. 282 quartiles, p. 282 Box-and-Whisker Plot A box-and-whisker plot displays a data set along a number line using medians. Store A’s median is about 43, and Store B’s is about 51. When making comparisons among the locations (medians) of various batches, a modified box pl ot called the notched box plot is useful. Box plots are often used for comparing the distributions of several groups of data, since they summarize the center and spread of the data very nicely. Then, construct a box-and-whisker plot with an ACCURATE number line! Box-and-Whisker Plots About this Lesson This is a foundational lesson for box-and-whisker plots (boxplots), a graphical tool used ... and compare dotplots (line plots., stemplots, bar graphs, histograms, and boxplots. 3. The five numbers that make up a box-and-whisker plot are called the . Draw a vertical line above the value of Q3, this forms the right end of the box. (Total for question 2 is 2 marks) Range Lower Quartile Median Upper Quartile Maximum Create a box and whisker plot using this data: 77, 99, 112, 85, 117, 68, 63. Store A’s box and right whisker are longer than Store B’s. five-number summary of the data set. Store A’s median Based on the box-and-whisker plots, which statement is true? this forms the left end of the box. The box-and-whisker plots below show a class’ test scores for two tests.What conclusions can you make? (200_07.GD_D.01) Create, interpret, and compare dotplots (line plots., into a small project by having students collect data which interests them and then write a comparison of the data to turn in to the teacher or to present to the class. 7. The Box-and-Whisker Plots lesson from the LTF Middle Grades Guide will provide a good resource for preparing to teach this lesson. The median (second quartile) divides the data set into two halves. Comparing Groups using Box Plots: When comparing two groups a box-and-whisker plot is used A Sample size of at least 30 is needed to generalize about a population How can we tell if the groups are different? - The _____ are the same for both tests. Give a descriptive title to the graph. 5. Draw a box plot for this information. The notches are constructed using the formula: 11,12,12,13,14,14,14,16,18 (1) The median income for nuclear engineers is greater than the income of all musicians. Draw a vertical line above the value of the median and complete the box. 4. Compare the centers of the box plots. Example: The numbers of first cousins of the students in a ninth-grade class are . "No overlap in spreads" or so there IS a difference between group 'A' & 'B' “B is greater than A” (2) The median income for police officers and musicians is the same. 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