# CC Investigation 5: Histograms and Box Plots

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1 Content Standards 6.SP.4, 6.SP.5.c CC Investigation 5: Histograms and Box Plots At a Glance PACING 3 days Mathematical Goals DOMAIN: Statistics and Probability Display numerical data in histograms and box plots. Summarize numerical data sets by giving quantitative measures of center and variability. Summarize numerical data sets by describing any overall patterns and any striking deviations from an overall pattern, given the context in which the data were gathered. Teaching Notes In this investigation, students will consider that a data distribution may not have a definite center and that different ways to measure center yield different values. The median is the middle value. The mean is the value that each data point would take on if the total of the data values were redistributed equally. Students also will explore how measures of variability (interquartile range or mean absolute deviation) can be useful for summarizing data. Two very different sets of data can have the same mean and median yet be distinguished by their variability. Students will learn to describe and summarize numerical data sets, identifying clusters, peaks, gaps, and symmetry, considering the context in which the data were collected. Vocabulary box plot median lower quartile upper quartile interquartile range histogram variability mean absolute deviation Problem 5.1 Before Problem 5.1, review mean, median, and mode as measures of center. Ask: What is the mean value of a set of data? (the sum of the data values divided by the number of values) How would you find the mean number of points scored? (Add the scores and then divide by the number of scores, 22.) What is the median value of a set of data? (the middle number when the data values are ordered from least to greatest) If there are 7 values in a data set, which is the median? (The median is the 4th value, when the values are ordered from least to greatest.) How do you find the median value for a data set containing an even number of values? (Find the mean of the two middle values, when the values are ordered from least to greatest.) If there are 8 values in a data set, what is the median? (The median is the mean of the 4th and 5th values, when the values are ordered from least to greatest.) What are the modes of a set of data? (the values that appear most often) Histograms and Box Plots 43

2 During Problem 5.1 C, ask: How many values are in the lower half of the scores? (11) After Problem 5.1, point out to students that box plots are good for comparing similar data very quickly, but do not show individual values. Ask: Can you tell from the box plot how many games the Panthers played? (No.) Can you tell from the box plot in how many games the Panthers scored more than 80 points? (No.) Can you tell from the box plot the fewest and most points scored? (Yes.) How is the median value of a data set affected if one data value lower than the median and one data value greater than the median are added to the set? (It does not change.) Problem 5.2 Before Problem 5.2, introduce students to histograms, including some of their limitations. Point out the sample Homework histogram, and ask: What frequency does the vertical axis represent? (the number of students who spent that much time on homework) What does the bar above indicate? (Six students spent between 10 and 19 minutes on homework.) How can you find the total number of students included in the data? (Add the numbers shown by the bars.) Does the histogram show what was the minimum amount of time any student spent on homework? (No, histograms do not display exact values.) Can you determine an exact median or mean from the histogram? (No, histograms do not display exact values.) During Problem 5.2 A, ask: What information are you losing in transferring the data from the table to the histogram? (all of the individual values, including least value, greatest value, and the measures that come from the individual values, including mean, median, and mode) What benefits does the histogram offer? (It shows quickly that most students study minutes, and the fewest study minutes.) Problem 5.3 During Problem 5.3, ask: What does the interquartile range represent? (the spread between the least and greatest values in the middle part of the data) How great would you characterize the variability of Grant s scoring? (Because the interquartile range is low, the data values do not vary too much; there is a relatively low variability in his scoring.) 44 Common Core Teacher s Guide

3 Problem 5.4 During Problem 5.4 B, ask: How do you find the distance between the data point and the mean? (Find the absolute value of the difference of the values.) After Problem 5.4, ask: How great would you characterize the variability of the team s scoring? (Because the mean absolute deviation is low, most of the data values do not vary too much; there is a relatively low variability in the scoring.) How are the data presented in this problem similar to the data presented in Problem 5.3? (Both data sets show little variability, but have a value that is very different than the pattern of the rest of the values.) Summarize To summarize the lesson, ask: What does the lower quartile of a set of data represent? (the median of the lower half of the values) What is the interquartile range? (the difference between the upper and lower quartiles) Which measure of center will be most affected if a single value much greater than the rest of the values is added to a data set? (mean) What is important to keep in mind about the intervals when making a histogram? (They must be the same size, and there can be no gaps between them.) What measures of center and variability cannot normally be found from data displayed only in a histogram? (median, mean, mode, interquartile range, and mean absolute deviation) What does a data set s variability tell you about the data? (the degree to which the data are spread out around an average value) How do you find the mean absolute deviation of a data set? (First, find the mean of the data set. Find the distance of each value in the set from that mean, and then find the mean of those distances.) Students in the CMP2 program will further study standards 6.SP.4 and 6.SP.5.c in the Grade 7 Unit Data Distributions. Assignment Guide for Investigation 5 Problem 5.1, Exercises 1 13, 23 Problem 5.2, Exercises Problem 5.3, Exercises 17 18, 22 Problem 5.4, Exercises Histograms and Box Plots 45

4 Answers to Investigation 5 Problem 5.1 A. 68, 68, 68, 72, 73, 78, 80, 80, 82, 82, 85, 86, 86, 86, 87, 88, 89, 90, 91, 91, 95, 96; minimum = 68; maximum = 96 B. 85.5; There is an even number of data values, so the median is the mean of the middle two values, 85 and 86; ( ) 2 = C. 78 D. 89 E = the difference between the maximum and minimum values of the middle half of the data F G. 1. to the left of the box showing the interquartile range 2. The team most often scored more than 75 points in each game. H. 1. It will increase the mean and median, but not affect the modes. 2. mean = ( ) 23 = 1, ; median = 86; modes = 68 and The mean increased from ( ) 22 = 1, to 83.3; the median increased from 85.5 to 86; the modes did not change Box plots do not show a data set s mean or mode. 6. The median increased by 0.5. Problem 5.2 A ; , 61 70, 71 80, 81 90, Five intervals divides the data into enough groups without making a histogram that is too large. 4. Interval Frequency 5. Frequency 6. Sample: Most of the winning scores were between 61 and 80 points, with very few scores of 60 or less. B. 1. Sample: Frequency Winning Scores at Basketball Tournament Number of Points Scores of Football Playoff Games Number of Points 2. Sample: Most of the scores were between 12 and 22 points, with very few scores of 11 points or less. 3. Sample: The intervals were different, with the scores in Part A being higher overall than the scores in Part B. The shapes of the data are similar. There are more data values shown in Part A than in Part B. 46 Common Core Teacher s Guide

5 Problem 5.3 A. 14; 12; 16 B = 4; The interquartile range is low, so Grant s scoring was quite consistent throughout the season. C. Most of the data fell within a very narrow range, except for the low value of 0. D. Yes; the number 0 falls outside the pattern of bunched data within the interquartile range. That value is much less than most of the rest of the numbers. Problem 5.4 A. 9; ( ) 6 = 54 6 = 9 B. 7: 2; 6 : 3; 17: 8; 8: 1; 7: 2; 9: 0 C = D. The number of goals scored is, on average, about 2.67 goals less than or about 2.67 goals greater than the mean. E. Yes; the score of 17 is much higher than the rest of the scores. Exercises 1. 3, 4, 9, 12, 18; , 18, 25, 29, 32; 4. a. 7.9, 9.1, 11, 13.2, 14; b c. Yes; the box plots show that this year s seedlings are smaller than last year s seedlings. All of the five-number summary values are less. 5. a. Box plots summarize key values that show distributions of data sets, and by making two box plots together, differences in these values can be seen easily. b. Box plots do not show the mean, and do not show the individual data values from which the mean could be calculated. 6. The mean increases from 84.2 to 91; the median increases from 88 to 90; there is no mode for either data set. 7. The score increased from 8 to a. First 8 Games All 15 Games , 4, 6.2, 8.05, 9.3; b. The mean increased from 4.5 to 5.8; the median increased from 5 to 6; the mode increased from 5 to The mean increased from 5 m to 6.5 m; the median increased from 5.5 m to 6 m; the modes changed from 0 and 6 to just The mean increased the most, by 1.5 m. 11. First Round Bonus Round Histograms and Box Plots 47

6 12. a. b. The mean increased from 20.1 ft to 43.5 ft; the median increased from 20 ft to 45 ft; the mode increased from 20 ft to 47 ft. 13. Sample: Frequency Sample: First 8 Flights Second 8 Flights Ages of Mall Shoppers Age History Exam Class Grades 16. B 17. a. Half of the data are clustered within a small interquartile range, between 87 and 91. b. The value 76 is much less than most of the rest of the data values, and far from the median. 18. about about about The interquartile range is very small, 3, and all but one value in the set falls within 5 of the median value, 12. The value 45 is much greater than any other value in the data set. 22. a. His number of points increased after the first 8 games. b. Brandon spent more time practicing taking 3-point shots, so he was more successful in making them. c. The median is the only measure of these that is shown on a box plot, so that is the only measure that will be shown between box plots of different data sets. d. First 8 Games Frequency All 20 Games Grade 15. Sample: Pumpkin Weights The box plots show that the median increased from 1.5 in the first 8 games to 6 for all 20 games. The quartiles and maximum values also increased, as did the interquartile range. Frequency Weight (in lb) 48 Common Core Teacher s Guide

8 Name Date Class Skill: Finding Mean Absolute Deviation Investigation 5 Histograms and Box Plots Find the mean absolute deviation for the set of data Skill: Reading Box Plots Give the five-number summary for each box plot. Find the range and the IQR Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved Common Core Teacher s Guide

10 Name Date Class Check-Up (continued) Investigation 5 2. The table shows the heights, in inches, of the basketball players on a USA Men s National Team. Histograms and Box Plots a. Make a histogram of the data. b. Summarize what the histogram shows about the data. 3. The table shows the heights, in inches, of the basketball players on a USA Women s National Team a. Make a histogram of the data. b. Summarize what the histogram shows about the data. Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved. c. Compare the histogram to the one you made in Problem 3. Explain what the differences in the graphs illustrate about the data. 52 Common Core Teacher s Guide

11 CC Investigation 5: Histograms and Box Plots A box plot is constructed from the five-number summary: the minimum value, lower quartile, median, upper quartile, and maximum value. DOMAIN: Statistics and Probability minimum lower quartile median upper quartile maximum Problem 5.1 The Panthers scored the following numbers of points during games this season: A. Order the set of data from the least to the greatest. What are the minimum and maximum values? B. Find the median. Explain how you found this value. C. The lower quartile is the median of the lower half of the scores. What is the lower quartile of the data? D. The upper quartile is the median of the upper half of the scores. What is the upper quartile of the data? E. 1. Find the difference between the upper quartile and the lower quartile. This difference is called the interquartile range. 2. What does the interquartile range represent? F. 1. Draw a number line from 60 to Above your number line, draw vertical line segments at the values you found for the median, the lower quartile, and the upper quartile. 3. Connect the vertical lines to form a rectangle. 4. Locate the value you identified as the minimum and draw a line to the left from the rectangle to meet that point. 5. Locate the value you identified as the maximum and draw a line to the right from the rectangle to meet that point. Histograms and Box Plots 47 Notes Histograms and Box Plots (47)52

12 G. 1. Where is a score of 75 found on your box plot? 2. What does the location of 75 tell you about the performance of the team this season? H. The Panthers scored 96 points in the first game of the playoffs. 1. How do you think this change will affect the mean, median, and mode of the numbers of points scored? 2. Find the mean, median, and mode for the 23 games played this season. 3. How did the mean, median, and mode change? 4. Make a new box plot to include the data for all 23 games. 5. Can you see the changes to the mean, median, or mode between the first and second box plots? Explain why or why not. 6. Which of the five-number-summary values changed the most? Explain your answer. 48 Common Core Additional Investigations Notes (48)52 Common Core Teacher s Guide

13 A histogram is a type of bar graph in which the bars represent numerical intervals. Each interval must be the same size, and there can be no gaps between them. In this histogram, there are 5 equal intervals of 10 minutes each. Problem 5.2 Frequency Homework Time (in minutes) A. The table shows the winning scores in the first round of the basketball tournament What are the greatest and least winning scores? 2. Divide the range of the data into equal intervals that will be represented by bars on the histogram. Give the range for each interval. 3. Explain why you chose that number of intervals. 4. Make a table to show the frequency of scores in each interval. 5. Make a histogram of the data. Draw a bar for each interval to represent the frequency. 6. Summarize what the histogram shows about the data. B. The table shows the scores of all of the games in the football playoffs Make a histogram of the data. 2. Summarize what the histogram shows about the data. 3. Compare the histogram to the one you made in Part A. Explain the differences the graphs illustrate about the data. Histograms and Box Plots 49 Notes Histograms and Box Plots (49)52

14 You can summarize data sets using measures of variability. Variability is the degree to which data are spread out around a center value. Problem 5.3 The box plot shows the number of points Grant scored in each game A. What are the median, lower quartile, and upper quartile of the data? B. What is the interquartile range? What does that number tell you about the how consistent Grant s scoring was this season? C. Describe the overall pattern of the data. D. Do there appear to be any scores that do not follow the pattern of the rest of the data? Explain what those values represents and what makes them unusual. A data set s mean absolute deviation is the average distance of all data values from the mean of the set. First, find the mean of the data set. Then find the distance of each value in the set from that mean and find the average of those distances. Problem 5.4 Paige s lacrosse team scored the following numbers of goals in the first six games of the season: 7, 6, 17, 8, 7, 9. A. What is the mean number of goals scored? Show your work. B. What is the distance of each data value from the mean? C. 1. What is the total distance of all of the data points from the mean? 2. The mean absolute deviation is the average of the these distances. What is the mean absolute deviation of the data? D. What does the mean absolute deviation tell you about the numbers of goals scored? E. Do you notice any value that does not follow the pattern of the rest of the data? Explain what makes that value unusual. 50 Common Core Additional Investigations Notes (50)52 Common Core Teacher s Guide

15 Exercises For Exercises 1 3, use a five-number summary to draw a box plot for each set of data A farmer starts 9 tomato plants in a greenhouse several weeks before spring. The seedlings look a little small this year so the farmer decides to compare this year s growth with last year s growth. This year s growth is measured in inches as: a. Use a five-number summary to draw a box plot for this set of data. Mark your number line from 0 to 20. b. Last year, the five-number summary for the tomato plants was 9, 11, 13.4, 16, 17. Draw a box plot for this set of data. Mark your number line from 0 to 20. c. Write this year s summary above last year s summary. Is the farmer s concern justified? Why or why not? 5. a. Explain why you would use a box plot when you have similar data to compare. b. Explain why you would not use a box plot if you needed to show the mean of the data. 6. CJ scored 85, 88, 94, 90, and 64 on math tests so far this grading period. His teacher allows students to retake the test with the lowest score and substitute the new test score. CJ scores a 98 on the retest. How does substituting the new test score affect the mean, median, and mode? 7. During a dance competition, Laura s dance team received scores of 9, 9, 8, 9, 10, 8, 3, and 8 from the judges. For each team, the highest and lowest scores are removed. The remaining scores are then averaged to find the team s final score. How was the team s final score affected when the highest and lowest scores were removed? 8. a. During the first 8 games of the basketball season, Rita made the following number of free throws: 0, 3, 5, 5, 4, 8, 5, and 6. During the next 7 games she made 8, 8, 8, 7, 9, 8, and 3 free throws. Make a box plot showing the data for the first 8 games and then the data for all of the games. b. How did the mean, median, and mode of the free-throw data change from the first 8 games compared to all of the games? Histograms and Box Plots 51 Notes Histograms and Box Plots (51)52

16 For Exercises 9 11, use the information below. Teams of two competed in the egg-toss distance competition. If the egg breaks, the distance is 0. The results for Dave and Paul s team are shown below for the first round. Dave and Paul s Egg-Toss Results Toss Distance (in meters) In a bonus round, each team can replace 1 toss from the first round. Dave and Paul make a toss of 12 meters. 9. How did the mean, median, and mode change after the toss from the bonus round? 10. Which measure mean, median, or mode changed the most? 11. Make a box plot using the data after the first round and then using the data after the bonus round. 12. Faye is writing an article in the school newspaper about the school s paper airplane flying competition. She records Wheeler s first flights in the table below. Wheeler s Paper Airplane Competition Results Flight Distance (in feet) After the first 8 flights, Wheeler adds a paper clip to the nose of his airplane. Faye records the results of his next 8 flights in the table below. Wheeler s Paper Airplane Competition Results Flight Distance (in feet) a. Make a box plot showing the data for the first 8 flights and then the data for the second 8 flights. b. How did the mean, median, and mode of the flight distances change from the first 8 flights to the second 8 flights? 52 Common Core Additional Investigations Notes (52)52 Common Core Teacher s Guide

17 For Exercises 13 15, make a histogram to display the set of data. 13. ages of mall shoppers: class grades on a history exam: weights of pumpkins (in lb): Multiple Choice What is the interquartile range of the data? A. 8 B. 20 C. 10 D a. Describe the overall pattern of the data shown in the box plot b. Identify any data value that is far outside the pattern and explain why it is outside the pattern. Histograms and Box Plots 53 Notes Histograms and Box Plots (53)52

18 For Exercises 18 20, find the mean absolute deviation for the set of data Describe the overall pattern of data in the following set. Identify any data value that is far outside the pattern and explain why it is outside the pattern After the eighth game and for the rest of the season, Brandon spent an hour after each practice working on 3-point baskets. He also practiced for another half-hour when he got home. His 3-point basket data for the entire season are shown below. Brandon s Points from 3-Point Baskets Game Points Game Points a. How did the data change after the first 8 games, if at all? b. Why do you think the data did, or did not, change? Explain. c. When data in a data set change, changes in which measures (mean, median, mode) will be shown in box plots? Explain your thinking. d. Display the data from Brandon s first 8 games in a box plot. Display the data from all 20 games in another box plot. Explain how differences between the two groups of data are shown in the plots. 54 Common Core Additional Investigations Notes (54)52 Common Core Teacher s Guide

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