1. Scatter plots & Trend Lines
Chapter 4 Section 5
Scatter plots & Trend Lines

2. Scatter plot
Is a graph with points plotted to show a possible relationship between two sets of data.
A scatter plot is an effective way to display some types of data.

3. Graphing a Scatter plot
Put in your notes
Make sure to give the graph a title
Label x & y.
Label the x & y axis
The scale for the x & y can be different scales
For example on the x-axis you could go up by 1’s and on the y-axis you could by 5’s.
Plot the ordered pairs

4. Let’s Practice
Make a scatter plot of the following data in your notes:

5. Scatter plot of Increase in List

6. Try one more
Graph the Football data in your notes packet

7. Scatter plot of Games

8. Correlation
Describes a relationship between two data sets. A graph may show the correlation between data.

9. Correlations

10. Describing Correlations from Scatter plots
Describe the correlation
Negative Correlation

11. Describing Correlations from Scatter plots
2) Describe the correlation
Positive Correlation

12. Identifying Correlations
Describe the Correlations:
3) The number of empty seats in a classroom and the number of students you would expect to see.
You would expect to see a negative correlation. As the number of students increases, the number of empty seats decreases.

13. Identifying Correlations
Describe the Correlations:
4) The number of pets a person owes and the number of books that person read last year.
You would expect to see no correlation. The number of pets a person owns has nothing to do with how many books the person has read.

14. Identifying Correlations
Describe the correlation
5) The monthly rainfall and the amount of water in a reservoir.
You would expect to see a positive correlation. As more rain falls, there is more water in the reservoir.

15. Identifying Correlations
Describe the correlation
6) The temperature in Houston and the number of cars sold in Boston.
No Correlation

16. Identifying Correlations
Describe the correlation
7) The number of members in a family and the size of the family’s grocery bill.
Positive Correlation

17. Identifying Correlations
Describe the correlation
8) The number of times you sharpen your pencil and the length of your pencil.
Negative Correlation

18. Complete Practice 4 -5 To be collected
Check your answer with the substitute

19. Homework due Tuesday Page 266: # 1-12 (To be collected tomorrow)
You will need graph paper for your homework to create the scatter plot
Core Ethical Value Typed Essay due on Thursday