1. Course 3
9-5
Displaying Data
A double-bar graph is used to display and compare two sets of data. You can organize data using a frequency table by listing items according to the number of times the items occur.

2. Additional Example 1: Displaying Data in a Double-Bar Graph
Course 3
9-5
Displaying Data
Additional Example 1: Displaying Data in a Double-Bar Graph
Make a double-bar graph.
The following are the number of books read in one month by some boys and girls in Grade 8.
Books read 1 2 3 4 5
Boys
Girls

3. Additional Example 1 Continued
Course 3
9-5
Displaying Data
Additional Example 1 Continued
Make a double-bar graph.
Frequency
Books read
The frequencies are the heights of the bars in the graph. Use a different color to represent each gender.

4. 9-5 Displaying Data Check It Out: Example 1 Make a double-bar graph.
Course 3
9-5
Displaying Data
Check It Out: Example 1
Make a double-bar graph.
The following are the number of tickets sold in one week by the boys and girls in Grade 8.
Tickets Sold 5 10 15 20 25
Boys 3 9 8 2
Girls 4 6

5. Check It Out: Example 1 Continued
Course 3
9-5
Displaying Data
Check It Out: Example 1 Continued
Make a double-bar graph.
Frequency
Tickets Sold
The frequencies are the heights of the bars in the graph. Use a different color to represent each gender.

6. Course 3
9-5
Displaying Data
A histogram is a bar graph that shows the frequency of data within equal intervals.

7. Additional Example 2: Displaying Data in a Histogram
Course 3
9-5
Displaying Data
Additional Example 2: Displaying Data in a Histogram
Jimmy surveyed 12 children to find out how much money they received from the tooth fairy. Use the data to make a histogram.
First, make a frequency table with intervals of $1.00. Then make a histogram.

8. Additional Example 2 Continued
Course 3
9-5
Displaying Data
Additional Example 2 Continued
Money ($)
Frequency
0 – 0.99 4
1.00 – 1.99 3
2.00 – 2.99 2
3.00 – 3.99 3

9. Additional Example 2 Continued
Course 3
9-5
Displaying Data
Additional Example 2 Continued
Frequency
Histograms do not have spaces between the bars.
Helpful Hint

10. 9-5 Displaying Data Check It Out: Example 2
Course 3
9-5
Displaying Data
Check It Out: Example 2
Tonya surveyed 14 children at an after school day care to find out how many hours they spend there. Use the data to make a Histogram.
2:00 1:40 3:00 0:30 1:00 1:30 2:30
0:30 2:45 1:00 2:00 1:35 1:30 3:00
First, make a frequency table with intervals of 30 minutes. Then make a histogram.

11. Check It Out: Example 2 Continued
Course 3
9-5
Displaying Data
Check It Out: Example 2 Continued
2:00 1:40 3:00 0:30 1:00 1:30 2:30
0:30 2:45 1:00 2:00 1:35 1:30 3:00
Time Spent at Day Care
Frequency
0:00 to 0:30 2
0:31 to 1:00
1:01 to 1:30
1:31 to 2:00 4
2:01 to 2:30 1
2:31 to 3:00 3

12. Check It Out: Example 2 Continued
Course 3
9-5
Displaying Data
Check It Out: Example 2 Continued
Frequency
Hours Spent at Day Care 1 2 3 4 5
0:00 to
0:30
0:31 to
1:00
1:01 to
1:30
1:31 to
2:00
2:01 to
2:30
2:31 to
3:00

13. Course 3
9-5
Displaying Data
A double-line graph is used to show how two related sets of data change over time.

14. Course 3
9-5
Displaying Data
Additional Example 3: Displaying Data in a Double-Line Graph
Make a double-line graph of the given data. Use the graph to estimate the number of CDs and DVDs sold in 2003.
The Music Shop CD and DVD Sales
Year
CD’s Sold
DVDs Sold
1998
3002
735
2000
3098
1057
2002
4685
3010
2004
5804
4047

15. 9-5 Displaying Data Additional Example 3 Continued Plot the data.
Course 3
9-5
Displaying Data
Additional Example 3 Continued
Plot the data.
The Music Shop CD and DVD Sales
Number Sold
Year
The graph shows about 5,250 CDs and 3,500 DVDs were sold in 2003.

16. 9-5 Displaying Data Check It Out: Example 3
Course 3
9-5
Displaying Data
Check It Out: Example 3
Make a double-line graph of the given data. Use the graph to estimate the number of Strawberries and Figs grown in 2002.
Perry's Strawberry-Fig Farm Sales
Year
Strawberry Baskets Sold
Figs Sold
1999
4,000
1,200
2001
4,500
2,000
2003
8,000
3,500
2005
5,500
3,200

17. 9-5 Displaying Data Check It Out: Example 3 Continued Plot the data.
Course 3
9-5
Displaying Data
Check It Out: Example 3 Continued
Plot the data.
Perry’s Strawberry-Fig Farm Sales
Number Sold
Year
The graph shows about 6,250 Strawberry Baskets and 2,800 Figs were sold in 2002.

18. Insert Lesson Title Here
Course 3
9-5
Displaying Data
Insert Lesson Title Here
Lesson Quiz: Part I
1. Make a histogram with intervals of 5 using the following data set: 7, 12, 8, 4, 4, 3, 6, 1, 14, 19, 8, 9 8 7 6 5 4 3 2 1
Frequency
Units
Frequency
0-4 4
5-9 5
10-14 2
15-19 1

19. Insert Lesson Title Here
Course 3
9-5
Displaying Data
Insert Lesson Title Here
Lesson Quiz: Part II
2. Estimate the temperature on January 6 in 2004 and 2005 using the graph below.
2005: 31°C, 2004: 30°C

20. Insert Lesson Title Here
Course 3
9-5
Displaying Data
Insert Lesson Title Here
Lesson Quiz: Part III
Use the graph for problems 3–4.
3. On what day did both girls exercise for 30 minutes?
Friday
4. On what day(s) did Ana exercise longer than Sue?
Monday, Wednesday, Thursday, and Saturday

21. Scatter Plot
A scatter plot is a graph of a collection of ordered pairs (x,y).
The graph looks like a bunch of dots, but some of the graphs are a general shape or move in a general direction.

22. Positive Correlation
If the x-coordinates and the y-coordinates both increase, then it is POSITIVE CORRELATION.
This means that both are going up, and they are related.

23. Positive Correlation
If you look at the age of a child and the child’s height, you will find that as the child gets older, the child gets taller. Because both are going up, it is positive correlation.
Age 1 2 3 4 5 6 7 8
Height “ 25 31 34 36 40 41 47 55

24. Negative Correlation
If the x-coordinates and the y-coordinates have one increasing and one decreasing, then it is NEGATIVE CORRELATION.
This means that 1 is going up and 1 is going down, making a downhill graph. This means the two are related as opposites.

25. Negative Correlation
If you look at the age of your family’s car and its value, you will find as the car gets older, the car is worth less. This is negative correlation.
Age of car 1 2 3 4 5
Value
$30,000
$27,000
$23,500
$18,700
$15,350

26. No Correlation
If you look at the size shoe a baseball player wears, and their batting average, you will find that the shoe size does not make the player better or worse, then are not related.

27. Which scatterplots below show a linear trend?
Negative
Correlation
Positive
Correlation b) d) f)
Constant
Correlation

28. Objective - To plot data points in the coordinate plane and interpret scatter plots.y
Sport Utility Vehicles
(SUVs) Sales in U.S. 5 4 3 2 1
Year
Sales (in Millions)
1991
0.9
1992
1.1
Vehicle Sales (Millions)
1993
1.4
1994
1.6
1995
1.7
1996
2.1
1997
2.4
1998
2.7 x
1999
3.2
Year

29. Scatterplot - a coordinate graph of data points.y
Trend appears linear. 5 4 3 2 1
Trend is increasing.
Vehicle Sales (Millions)
Positive correlation.
Predict the sales in 2001. x
Year

30. Plot the data on the graph such that homework time
is on the y-axis and TV time is on the x-axis..
Time Spent
Watching TV
Time Spent
on Homework
Student
Sam
30 min.
180 min.
Jon
45 min.
150 min.
Lara
120 min.
90 min.
Darren
240 min.
30 min.
Megan
90 min.
90 min.
Pia
150 min.
90 min.
Crystal
180 min.
90 min.

31. Plot the data on the graph such that homework time
is on the y-axis and TV time is on the x-axis. TV
Homework
240
210
180
150
120 90 60 30
30 min.
180 min.
45 min.
150 min.
120 min.
90 min.
Homework
Time on
240 min.
30 min.
90 min.
120 min.
150 min.
120 min.
180 min.
90 min.
Time Watching TV

32. Describe the relationship between time spent on
homework and time spent watching TV.
Trend appears linear.
240
210
180
150
120 90 60 30
Trend is decreasing.
Homework
Time on
Negative correlation.
Time Watching TV