1. Graphing Notes

2. 1. Choosing the Right Graph
__________ provide an organized way of viewing information, and ______ are pictures of the information in a data table.
Can be _____ and _____ to interpret data by looking at a graph.
Must choose the __________ of graph to illustrate your data.
Data tables
graphs
faster
easier
correct type

3. Bar Graph: Used to _______ data.
Ex’s:
1. Growth of plants in different pots.
2. Grade distribution of students enrolled in science class.
compare

4. changes time Line Graph: Used for looking at _______ over ____. Ex’s:
1. Change in your height throughout the year.
2. Number of bathing suits sold each month during the year.
changes
time

5. Pie Graph: Used for showing __________. percentages
Ex’s:
1. % of allowance that will go toward purchasing various things.
2. % of student body who picked certain entrees for lunch.
percentages

6. Let’s Practice!
Choose the Graph: What graph type do you think best presents each set of data? Why?

7. 1. The percentage of rabbits preferring various foods.
Answer: A pie graph because the data is given as percents.
Type of Food
% Preferring That Food
Skippy’s Rabbit Chow 32
Homemade Rabbit Food 13
Happy Rabbit 10
Joe’s Special Food for Rabbits 45

8. # of Jelly Beans Consumed
2. The number of jelly beans eaten by students in 1 minute.
Answer: A bar graph because the data is comparing how many jelly beans each student ate in 1 minute.
Student
# of Jelly Beans Consumed
Anthony 15
Keiko 28
Leigh Ann 58
Adam 22
Katie 12

9. 3. Albert’s grades for each month of the school year.
Answer: A line graph because the data shows change over time.
Month
Grade in Science Class
September 98
October 94
November 88
December 78
January 82
Month
Grade in Science Class
February 83
March 86
April 81
May 97

10. Amount of Daily Sunlight Exposure (min) Average Height of Plants (cm)
4. The average plant height for different daily sunlight exposure.
Answer: A bar graph because the data is comparing the average plant height for different sunlight exposures.
Amount of Daily Sunlight Exposure (min)
Average Height of Plants (cm) 50
14.8 60
14.9 95
15.2 75
15.1
110
16.5

11. 2. Steps to Making Bar and Line Graphs
Step 1: Set up your _____ with an x-axis and y-axis.
The x-axis is _________ and represents the ___________ variable.
Variable being tested.
The y-axis is ______ and represents the _________ variable.
What is measured to see if there is a change.
horizontal
independent
vertical
dependent

12. YOU + Sugar = YOU + Anchovies = YOU + Pizza =
Ex: Independent and Dependent Variables
Dependent
Constant
Independent
YOU + Sugar =
YOU + Anchovies =
YOU Pizza =

13. Example: Step 1 – Label x & y axes
number of students
y-axis: dependent variable
Number of Students
grades
x-axis: independent variable

14. Must ____ the x and y axes with ____ (when appropriate). scale
Step 2: Choose a _____ for the x and y axes.
Scale must be ____________ intervals that start at ____ and include all of your data.
Must ____ the x and y axes with ____ (when appropriate).
scale
evenly spaced
zero
label
units

15. Example: Step 2 – choose an appropriate scale for the x & y axes
80 --
70 --
60 --
50 --
40 --
30 --
20 --
10 --
Number of Students
A B C D F
Grades

16. Step 3: Determine what _____ to make and ____ your ____ from data table on the graph.
plot
data

17. Example: Step 3 – Plot Your Data
80 --
70 --
60 --
50 --
40 --
30 --
20 --
10 --
Data Table
Grade
# of students A 22 B 79 C 50 D 9 F 2
Number of Students
A B C D F
Grades

18. Step 4: Give your graph a ____
Step 4: Give your graph a ____. Title should include the ___________ and dependent _______.
title
independent
variable

19. Example: Step 4 – Give Graph a Title
Title: Grades Earned by Students
80 --
70 --
60 --
50 --
40 --
30 --
20 --
10 --
Number of Students
A B C D F
Grades