2. Main Idea and New Vocabulary Example 1: Construct a Scatter Plot
Key Concept: Types of Relationships
Example 2: Interpret Scatter Plots
Example 3: Make Conjectures About Scatter Plots
Example 4: Make Conjectures About Scatter Plots
Example 5: Make Conjectures About Scatter Plots
Lesson Menu

3. Construct and make conjectures about scatter plots.
Main Idea/Vocabulary

4. Construct a Scatter Plot
DRIVING Construct a scatter plot of the distance required to stop a car traveling at given speeds.
Example 1

5. Construct a Scatter Plot
Let the horizontal axis, or x-axis, represent the speed. Let the vertical axis, or y-axis, represent the distance. Then graph the ordered pairs (speed, distance).
Answer:
Example 1

6. CAMPS Construct a scatter plot of the number of campers at a summer camp.
A. C.
B. D.
Example 1 CYP

7. Key Concept 2

8. Interpret Scatter Plots
HOT CHOCOLATE Explain whether the scatter plot of the data for cups of hot chocolate sold at a concession stand and the outside temperature shows a positive, negative, or no relationship.
Answer: As the temperature increases, the number of cups sold decreases. Therefore, the scatter plot shows a negative relationship.
Example 2

9. A. positive relationship B. negative relationship
CAMPS Explain whether the scatter plot of the data for the number of campers at a summer camp shows a positive, negative, or no relationship.
A. positive relationship
B. negative relationship
C. no relationship
Example 2 CYP

10. Make Conjectures About Scatter Plots
FUEL The table shows the average extra fuel used by drivers in one city due to travel delays in congested areas. Construct a scatter plot of the data.
Example 3

11. Make Conjectures About Scatter Plots
Let the horizontal axis represent the year and let the vertical axis represent the excess fuel.
Answer:
Example 3

12. OCEANS The table shows the water temperature of an ocean at different depths. Construct a scatter plot of the data.
A. C.
B. D.
Example 3 CYP

13. Make Conjectures About Scatter Plots
FUEL The scatter plot shows the average extra fuel used by drivers in one city due to travel delays in congested areas. Explain whether the scatter shows a positive, negative, or no relationship.
Answer: As years increase, excess fuel increases. So, the scatter plot shows a positive relationship.
Example 4

14. A. positive relationship B. negative relationship
OCEANS The scatter plot shows the water temperature of an ocean at different depths. Explain whether the scatter shows a positive, negative, or no relationship.
A. positive relationship
B. negative relationship
C. no relationship
Example 4 CYP

15. Make Conjectures About Scatter Plots
FUEL The scatter plot shows the average extra fuel used by drivers in one city due to travel delays in congested areas. If a relationship exists, make a conjecture about the excess fuel that will be used by an average driver in 2010.
Example 5

16. Make Conjectures About Scatter Plots
The scatter plot shows a positive relationship. If the trend continues, the number of gallons of excess fuel will probably increase by about 6 or 7 gallons in the next 5 years.
= 37 and = 38
Answer: So, in 2010, the average driver will use about 37 or 38 gallons of excess fuel.
Example 5

17. D. no relationship exists
OCEANS The scatter plot shows the water temperature of an ocean at different depths. If a relationship exists, make a conjecture about the temperature of the water at a depth of 800 feet.
A. about 0°C
B. about 3°C
C. about 6°C
D. no relationship exists
Example 5 CYP