1. Holt CA Course 1 11-4Scatter Plots Warm Up Warm Up California Standards California Standards Lesson Presentation Lesson PresentationPreview

2. Holt CA Course 1 11-4Scatter Plots Warm Up Graph each point on the same coordinate plane. 1. A (5, 20) 2. B (20, 15) 3. C (10, 40) 4. D (30, 35) A B C D

3. Holt CA Course 1 11-4Scatter Plots SDAP1.2 Represent two numerical variables on a scatterplot and informally describe how the data points are distributed and any apparent relationship that exists between the two variables (e.g., between time spent on homework and grade level). California Standards

4. Holt CA Course 1 11-4Scatter Plots Vocabulary scatter plot correlation positive correlation negative correlation no correlation line of best fit

5. Holt CA Course 1 11-4Scatter Plots A scatter plot is a graph with points plotted to show a possible relationship between two sets of data.

6. Holt CA Course 1 11-4Scatter Plots Use the given data to make a scatter plot of the weight and height of each member of a basketball team. Additional Example 1: Making a Scatter Plot of a Data Set Use the table to make ordered pairs for the scatter plot. The points on the scatter plot are (71, 170), (68, 160), (70, 175), (73, 180), and (74, 190).

7. Holt CA Course 1 11-4Scatter Plots Use the given data to make a scatter plot of the weight and height of each member of a soccer team. Check It Out! Example 1 12062 13568 17569 15667 12563 Weight (lbs)Height (in) 200 190 180 170 160 150 140 130 120 60 61 62 63 64 65 66 67 68 69 The points on the scatter plot are (63, 125), (67, 156), (69, 175), (68, 135), and (62, 120). Height Weight Use the table to make ordered pairs for the scatter plot.

8. Holt CA Course 1 11-4Scatter Plots A correlation describes a relationship between two data sets. The correlation can help you analyze trends and make predictions. There are three types of correlations between data.

9. Holt CA Course 1 11-4Scatter Plots Write positive correlation, negative correlation, or no correlation to describe each relationship. Explain. Additional Example 2: Determining Relationships Between Two Sets of Data The graph shows that as area increases, population increases. The graph shows a positive correlation between the data sets.

10. Holt CA Course 1 11-4Scatter Plots Write positive correlation, negative correlation, or no correlation to describe each relationship. Explain. Check It Out! Example 2 The graph shows that as the year increases, number of tornados increases. The graph shows a positive correlation between the data sets.

11. Holt CA Course 1 11-4Scatter Plots A line of best fit, or trend line, is a straight line that approximates the relationship between the data on a scatter plot. You can also use a line of best fit when making predictions based on data.

12. Holt CA Course 1 11-4Scatter Plots Use the data to predict how much a worker will earn in tips in 10 hours. Additional Example 3: Using a Scatter plot to Make Predictions Draw a line that has about the same number of points above and below it. Your line may or may not go through the data points. According to the graph, a worker will earn approximately $24 in tips in 10 hours. Find the point on the line whose x- value is 10. The corresponding y- value is 24.

13. Holt CA Course 1 11-4Scatter Plots Use the data to predict how many circuit boards a worker will assemble in 10 hours. Check It Out! Example 3 According to the graph, a worker will assemble approximately 10 circuit boards in 10 hours. Hours Worked486911 Circuit Board Assemblies275812 14 12 10 8 6 4 2 2 4 6 8 10 12 14 Hours Circuit Board Assemblies Draw a line that has about the same number of points above and below it. Your line may or may not go through the data points. Find the point on the line whose x-value is 10. The corresponding y-value is 10.

14. Holt CA Course 1 11-4Scatter Plots Lesson Quiz: Part I 1. Use the given data to make a scatter plot. Grading Period1234 Number of A’s56810

15. Holt CA Course 1 11-4Scatter Plots Lesson Quiz: Part II Identify the correlation that you would expect to see between each pair of data sets. 2. the minimum wage and the year 3. the amount of precipitation and the day of the week 4. the amount of germs on your hands and the number of times you wash your hands in a day no correlation positive correlation negative correlation