# Ms. Drake 7th grade Math Measures of Central Tendency Lesson 7 Box and Whisker Plots.

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Ms. Drake 7th grade Math Measures of Central Tendency Lesson 7 Box and Whisker Plots

Measures of Central Tendency Vocabulary Bar graph Box- and-Whisker Plot Circle Graph Cumulative Frequency Double Bar Graph First Quartile Frequency Table

Measures of Central Tendency Vocabulary Histogram Line Graph Lower Extreme Mean Median Mode Negative Correlation No correlation

Measures of Central Tendency Vocabulary Outlier Population Positive correlation Quartile Random Sample Range Sample

Measures of Central Tendency Vocabulary Scatter Plot Second Quartile Sector Stem-and-Leaf Plot Third Quartile Upper Extreme

Box and Whisker Plot A box and whisker plot is a graph that displays the highest and lowest quarters of data as whiskers, the middle two quarters of the data and the median.

Box and Whisker Plot

Constructing a Box and Whisker Plot Step 1: Find the lower and upper extremes, the median, and the first and third quartiles

Lets try it… This data tells the distance it takes for cars to stop at a red light. VehicleStopping Distance (ft) A120 B158 C142 D131 E128 F167 G136

Identify the Lower and Upper Extremes 120, 128, 131, 136, 142, 158, 167 Find the median and the first and third quartile

Find the First and Third Quartile

Constructing a Box and Whisker Plot Step 2: Draw a number line. Above the number line plot points representing the lower and upper extremes, the median and the first and third quartiles

Constructing a Box and Whisker Plot Step 3: Draw a box through the first and third quartiles. Inside the box, draw a vertical line through the median. Then draw lines from the first and third quartiles to the extremes. These lines are called the whiskers.

Make the box, mark the median, draw the whiskers.

Use this data to construct a box and whiskers plot Median: 11 Lower Quartile: 7 Upper Quartile: 13 Lower Extreme: 1 Upper Extreme: 21

Median: 11, Lower Quartile: 7 Upper Quartile: 13, Lower Extreme: 1 Upper Extreme: 21

Until next time…

102 75% 88 50%

25% 60-20

Resources http://mathlearnnc.sharpschool.c om/cms/One.aspx?portalId=4507 283&pageId=5149151

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