# SCATTER PLOTS AND TREND LINES

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1 Name SCATTER PLOTS AND TREND LINES VERSION 2 Lessons You have collected the following data while researching the Winter Olympics. You are trying to determine if there is a relationship between the year of the Winter Olympics and the number of sports in the Winter Olympics. Year Number of Sports a. Create a scatter plot for the data. Be sure to label the axes and scale the graph appropriately. It may be helpful to break the x-axis to accommodate the year data. Copyright 2016 by The University of Kansas 1

2 Name 1.b. Sketch a trend line through the data points and determine whether the trend line reflects a positive or negative association in the data. 1.c. If you were asked to use your trend line to predict the number of sports for the year 1924, what would you say? Do you think your trend line is an accurate predictor for this time frame? 1.d. Estimate the slope of your trend line. What does this mean in terms of the variables in the problem situation? 1.e. If this trend continues, about how many sports will there be in the Winter Olympics in the year 2030? Is this a reasonable prediction? Why or why not? 1.f. Write the ordered pair of a data point that would be considered an outlier in this problem situation. What makes this point an outlier? Copyright 2016 by The University of Kansas 2

3 Name 2. Use the scatter plot below to answer the following questions. 2.a. Draw the line y = 5.5 on the scatter plot in black. Is this an appropriate trend line for the data? Why or why not? 2.b. Draw the line y = " x on the scatter plot in blue. Is this an appropriate trend line for the data? # Why or why not? 2.c. Draw the line y = x on the scatter plot in red. Is this an appropriate trend line for the data? Why or why not? 2.d. What is the y-intercept of the trend line that is appropriate for this data set? What does this point mean in terms of the variables in the problem situation? Copyright 2016 by The University of Kansas 3

4 Name 3. Describe the information you would have to collect to create a scatter plot. 4. Explain the difference between a group of points on a scatter plot and a group of points that lie on the graph of a linear function or trend line. Your explanation should include requirements for how points lie on the graph of a scatter plot versus the graph of a linear function or trend line. 5. Sketch a scatter plot with a negative linear association. 6. Sketch a scatter plot with a positive linear association. Copyright 2016 by The University of Kansas 4

5 Name 7. Sketch a scatter plot with no association. 8. Sketch a scatter plot with a nonlinear association. 9. What should you consider when drawing a trend line through a data set? 10. What factors should be considered when interpreting the y-intercept of a trend line? Copyright 2016 by The University of Kansas 5

6 18 KEY SCATTER PLOTS AND TREND LINES STUDENT ACTIVITY SOLUTION GUIDE: VERSION 2 Lessons You have collected the following data while researching the Winter Olympics. You are trying to determine if there is a relationship between the year of the Winter Olympics and the number of sports in the Olympics. Year Number of Sports

7 KEY 19 1.a. Create a scatter plot for the data. Be sure to label the axes and scale the graph appropriately. It may be helpful to break the x-axis to accommodate the year data. Student incorrectly plots points. Student is inconsistent in scaling the x- axis, the y-axis, or both. may be confusing x- and y-values when plotting points from a table does not understand that within an axis on a graph, the scale must be consistent CONSTRUCT A GRAPH USING A TABLE CHOOSE AN APPROPRIATE SCALE FOR A DISPLAY

8 20 KEY 1.b. Sketch a trend line through the data points and determine whether the trend line reflects a positive or negative association in the data. The trend line reflects a positive association in the data.

9 KEY 21 The student identifies a negative association instead of positive association in the scatter plot. The student draws a horizontal line or a line through the data points. The student draws a line with a positive slope but draws through the point (0, 0) and therefore does not follow the trend of the data or keep the trend line centrally located in the data. The student does not draw a straight line and/or tries to connect each point in the scatter plot. may be reading the data from right to left instead of left to right or is confusing positive and negative association knows the trend line needs to go through the center of the data but does not understand what it means to follow the trend of the data thinks the trend line needs to go through the origin and the center of the data but does not understand what it means to follow the trend of the data does not understand that a trend line must be a single, straight line and that it does not need to go through every point on the scatter plot EXPLAIN A POSITIVE OR NEGATIVE ASSOCIATION OF DATA DISPLAYED IN A SCATTER PLOT REPRESENT A TREND LINE FOR A SCATTER PLOT REPRESENT A TREND LINE FOR A SCATTER PLOT REPRESENT A TREND LINE FOR A SCATTER PLOT 1.c. If you were asked to use your trend line to predict the number of sports for the year 1924, what would you say? Do you think your trend line is an accurate predictor for this time frame? I would not be able to use my trend line to predict the number of sports in the year Because I don t have any data close to that time frame and it is distant from the data on the scatter plot, I do not think the trend line would be accurate for the year The student believes that the trend line can be used for the year unable to infer information presented in graphs to answer a question USE GRAPHS TO READ BEYOND THE DATA

10 22 KEY 1.d. Estimate the slope of your trend line. What does this mean in terms of the variables in the problem situation? The slope of the trend line is about # (student answers will vary, but \$ should be close). This means that there is about one additional sport every 6 years. Since the Olympics occur every 4 years, it would be reasonable to anticipate an increase of about one new sport every one to two Winter Olympics. The student gives a slope that is not close to # \$. The student identifies an accurate slope but cannot explain what the slope means in terms of the year and number of sports in the Winter Olympics. does not understand how to find the slope of a line cannot interpret information about rate of change or slope from a graph EXPLAIN SLOPE EXPLAIN THE SLOPE IN THE CONTEXT OF A PROBLEM OR DATA SET 1.e. If this trend continues, about how many sports will there be in the Winter Olympics in the year 2030? Is this a reasonable prediction? Why or why not? If the trend continues, there would be about 19 sports in the Winter Olympics in I think this is a reasonable estimate because the data value is relatively close to the data values on the scatter plot and because 19 seems like a possible number of winter sports for the Olympics. (Answers may vary, but student predictions should be relatively close to 19 sports.)

11 KEY 23 The student provides a number much higher or lower than 19. The student identifies an acceptable value as a prediction, but cannot explain why it is reasonable. may use the points in general instead of the trend line to predict the value cannot interpret the information in the scatter plot based on the variables in the problem situation USE GRAPHS TO READ BEYOND THE DATA USE SCATTER PLOTS TO READ THE DATA 1.f. Write the ordered pair of a data point that would be considered an outlier in this problem situation. What makes this point an outlier? Answers will vary. Possible outliers include (1998, 6), (1976, 15), and (2014, 10). These points are outliers because they deviate from the overall pattern in the data and are substantially different than the other values in the data set. The student chooses points that are in line with the trend of the data. The student cannot explain what makes the point they chose an outlier. may not understand the difference between outliers in single variable data and bivariate data knows to choose a point that is not near the data but cannot express this understanding verbally RECOGNIZE OUTLIERS EXPLAIN OUTLIERS

12 24 KEY 2. Use the scatter plot below to answer the following questions. 2.a. Draw the line y = 5.5 on the scatter plot in black. Is this an appropriate trend line for the data? Why or why not? This is not an appropriate trend line for the data. Although the line is centrally located in the data and approximately divides the data in half, it does not define the trend of the data.

13 KEY 25 The student graphs the line accurately but identifies this equation as an appropriate trend line for the data. The student graphs the line accurately and states this equation is not an appropriate trend line for the data but cannot explain why. knows the trend line needs to go through the center of the data but does not understand what it means to follow the trend of the data unable to describe what a trend line should look like related to the data points on a scatter plot REPRESENT A TREND LINE FOR A SCATTER PLOT EXPLAIN TREND LINE FOR SCATTER PLOTS 2.b. Draw the line y =! x on the scatter plot in blue. Is this an appropriate trend line for the data? \$ Why or why not? This is an appropriate trend line for the data. The line is centrally located in the data, and it defines the trend of the data.

14 26 KEY The student graphs the line accurately but does not identify this equation as an appropriate trend line for the data. The student graphs the line accurately and states this equation is an appropriate trend line for the data but cannot explain why. The student graphs the line with an incorrect slope (e.g., the reciprocal slope), then states this equation is not an appropriate trend line for the data. thinks the trend line should be horizontal, go through the origin, or connect each point in the scatter plot unable to describe what a trend line should look like related to the data points on a scatter plot understands whether a trend line is appropriate but sketches the graph using an incorrect slope REPRESENT A TREND LINE FOR A SCATTER PLOT EXPLAIN TREND LINE FOR SCATTER PLOTS EXPLAIN SLOPE 2.c. Draw the line y = x on the scatter plot in red. Is this an appropriate trend line for the data? Why or why not? This is not an appropriate trend line for the data. Although the line is centrally located in the data and approximately divides the data in half, it does not define the trend of the data.

15 KEY 27 The student graphs the line accurately but identifies this equation as an appropriate trend line for the data. The student graphs the line accurately and states this equation is not an appropriate trend line for the data but cannot explain why. The student graphs the line with an incorrect slope (e.g., the reciprocal slope), then states this equation is not an appropriate trend line for the data. thinks the trend line needs to go through the origin and the center of the data but does not understand what it means to follow the trend of the data unable to describe what a trend line should look like related to the data points on a scatter plot understands whether a trend line is appropriate but sketches a graph using an incorrect slope REPRESENT A TREND LINE FOR A SCATTER PLOT EXPLAIN TREND LINE FOR SCATTER PLOTS EXPLAIN SLOPE 2.d. What is the y-intercept of the trend line that is appropriate for this data set? What does this point mean in terms of the variables in the problem situation? The y-intercept of the trend line that is appropriate for this data set is (0, 1.5). This means that if someone spends 0 hours playing video games per day, the highest level reached on the video game is level 1.5.

16 28 KEY The student chooses the appropriate equation for the trend line but does not identify the y-intercept as (0, 1.5). The student identifies (0, 5.5) or (0, 0) as the y-intercept and chooses the equation y = 5.5 or y = x, respectively, as the appropriate equation for the trend line. The student identifies the y-intercept as (0, 1.5) but cannot explain what it means in terms of the variables in the problem situation. cannot explain what the y-intercept is on a graph knows how to find the y-intercept but does not correctly represent the trend line for a scatter plot knows what a y-intercept is but cannot explain its meaning in a problem situation EXPLAIN Y-INTERCEPT REPRESENT A TREND LINE FOR A SCATTER PLOT EXPLAIN AN INTERCEPT IN THE CONTEXT OF A PROBLEM OR DATA SET 3. Describe the information you would have to collect to create a scatter plot. To create a scatter plot, I would need to collect bivariate data. In other words, I would need to collect data with information about two different variables to create a scatter plot. The student cannot identify what type of data or how many variables are needed to create a scatter plot. can plot points and perform procedures with scatter plots but does not understand the criteria for the data used for the scatter plot EXPLAIN A SCATTER PLOT AS A WAY TO REPRESENT BIVARIATE DATA

17 KEY Explain the difference between a group of points on a scatter plot and a group of points that lie on the graph of a linear function graph or trend line. Your explanation should include requirements for how points lie on the graph of a scatter plot versus the graph of a linear function or trend line. Points on a scatter plot do not need to follow a linear pattern. When the points do fall in a linear pattern, there is still variation due to the natural variability of real-world data. Additionally, scatter plots do not have to be functions (an x-value may have more than one corresponding y- value). Linear function graphs and trend lines, however, will always have points that fall in a single, straight line, and they must be functions (each input has exactly one output). The student does not describe any differences between linear function graphs and scatter plots, noting that both involve points and that scatter plots can have a linear association. does not interpret the difference between the meaning of the points on the scatter plot and the points on a linear function USE SCATTER PLOTS TO READ THE DATA

18 30 KEY 5. Sketch a scatter plot with a negative linear association. Answers may vary. Any scatter plot with a negative linear trend is appropriate. Below is an example solution. The student sketches a scatter plot with a positive linear association. The student sketches a scatter plot with a negative association, but the points do not follow a linear trend. may be confusing the difference between positive and negative association may not be able to distinguish between linear and nonlinear associations in data EXPLAIN A POSITIVE OR NEGATIVE ASSOCIATION OF DATA DISPLAYED IN A SCATTER PLOT EXPLAIN A LINEAR OR NONLINEAR ASSOCIATION OF DATA DISPLAYED IN A SCATTER PLOT

19 KEY Sketch a scatter plot with a positive linear association. Answers may vary. Any scatter plot with a positive linear trend is appropriate. Below is an example solution. The student sketches a scatter plot with a negative linear association. The student sketches a scatter plot with a positive association, but the points do not follow a linear trend. may be confusing the difference between positive and negative association may not be able to distinguish between linear and nonlinear associations in data EXPLAIN A POSITIVE OR NEGATIVE ASSOCIATION OF DATA DISPLAYED IN A SCATTER PLOT EXPLAIN A LINEAR OR NONLINEAR ASSOCIATION OF DATA DISPLAYED IN A SCATTER PLOT

20 32 KEY 7. Sketch a scatter plot with no association. Answers may vary. Any scatter plot with no trend is appropriate. Below is an example solution. The student sketches a scatter plot with a nonlinear association. interprets no association as nonlinear association rather than data that do not have a trend or pattern EXPLAIN A LINEAR OR NONLINEAR ASSOCIATION OF DATA DISPLAYED IN A SCATTER PLOT

21 KEY Sketch a scatter plot with a nonlinear association. Answers may vary. Any scatter plot with a nonlinear trend is appropriate. Below is an example solution. The student sketches a scatter plot with no association. interprets nonlinear association as no association rather than a trend or association that is curved EXPLAIN A LINEAR OR NONLINEAR ASSOCIATION OF DATA DISPLAYED IN A SCATTER PLOT 9. What should you consider when drawing a trend line through a data set? Trend lines should be centrally located in the data points and define the trend of data with a linear association.

22 34 KEY The student incorrectly describes a trend line or cannot provide an explanation for an accurate trend line. can draw a trend line on a scatter plot but cannot describe a trend line EXPLAIN TREND LINE FOR SCATTER PLOTS 10. What factors should be considered when interpreting the y-intercept of a trend line? When asked to interpret the y-intercept of a trend line, you should consider whether the x-axis has been broken to graph the data. If the x-axis was broken, what appears to be the y-intercept on the graph is not an accurate point because it does not take into consideration the break in the x-axis. Additionally, you should consider whether the y- intercept is close to the data points on the scatter plot. Trend lines can be used to predict values near the data, but they may not be realistic in portions of the scatter plot that are distant from the plotted points. The student does not consider whether the y-intercept is far away from the data points in the scatter plot or does not consider a break in the scale of the x- axis. The student s description does not imply accurate knowledge of the location of the y-intercept. cannot extend or infer information on a scatter plot does not understand the meaning of the term y-intercept USE GRAPHS TO READ BEYOND THE DATA EXPLAIN Y-INTERCEPT

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