Warm Up • ENTERTAINMENT use the data below. It shows the gross collected during several Broadway seasons. Broadway Season Earnings Year Earnings ($ million) 1997–1998 558 1998–1999 588 1999–2000 603 2000–2001 666 1. Make a scatter plot of the data 2. Use your scatter plot to predict about how much money a Broadway season will gross in 2005– 2006, if the trend continues. Lesson 2-3 Notes: Line Plots Objective: Construct and interpret line plots Vocabulary • A line plot is a diagram that shows the frequency of data on a number line Example Make a Line Plot 1. BUILDINGS Make a line plot of the data shown Step 1 Draw a number line Step 2 Put an X above the number that represents the number of stories in each building Make some observations about the distribution of data The range of the data, is the difference between the greatest and least numbers in the data set Example Use a Line Plot to Analyze Data 2. SHOES The line plot below shows prices for different basketball shoes. What is the range of the data? The greatest price is $100, and the lowest price is $30. Range: 100–30 or 70 The range of the prices is $70. 3. Identify any clusters, gaps, and outliers in the data in Example 2 and explain what they mean Many of the data cluster around $75. You could say that most of the shoes cost from $70 to $85. There is a gap from $30 to $50, so there were no shoes in this price range. The number 30 appears removed from the rest of the data, so it could be considered an outlier. This means that $30 is an extremely low price and not representative of the whole data set. On Your Own a. Identify the range of the data in Example 1 Range: 73 – 17 = 56 The range of the stories is 56.
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