1. Graphing

2. Why do we use Graphs?
To make an organized, visual representation of data

3. Reading graphs Title? Values on the x-axis? Values on the y-axis?
How many data points are there?
Highest temp?
Lowest temp?
Trend?

24. Students’ Favorite After School Activities Adopt Student Uniforms
Activity
# of Students
Play Sports 45
Talk on the Phone 53
Visit with Friends 99
Earn Money 44
Chat Online 66
School Clubs 22
Watch TV 37
Making Graphs
Bar Graph
Make a graph for each of the following sets of data.
Use a line graph, a bar graph and a pie chart
Adopt Student Uniforms
Response
# of Students %
Yes 30 10 No
180 60
Maybe 90
Sam’s Weight
Month
Weight in kg
January 49
February 54
March 61
April 69
May 73
Line Graph
Pie Chart

25. Graphical Relationships
Direct Relationship: as one factor increase, the other factor increases
Example: DESCRIBE one of the graphs in WORDS:

26. Direct relationship
Examples: photosynthesis increases as the amount of sunlight increases
Anna’s height increased as she got older
As the amount of effort you put in increases, the amount of progress you make increases

27. Inverse Relationship
Inverse Relationship: as one factor increase, the other factor decreases
DESCRIBE IN WORDS

28. Inverse Relationship
Example: as the price of basketball tickets increases, the amount of people attending games decreases.
As the temperature increases, the rate of photosynthesis decreases

29. Cyclic Relationship
Cyclic Relationship: As one factor increases, the other follows in a predictable pattern
Examples: the tides come in and out every day
As the seasons pass, the temperature changes in a predictable manner

30. No Relationship
No relationship: when one factor increases, the other stays the same
Example: as the temperature increases, the matter in the rock stays the same
As time increases, the number of planets in the solar system stays the same