Graphs
3/12/2016
1
Today I want you to help
me make a graph.
I want to make a graph that shows
the change in temperature
throughout the day yesterday.
What kind of graphs could we
make to show this?
3/12/2016
2
Bar Graph vs Line Graph
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3/12/2016
What is the difference
between a bar graph
and a line graph?
3
Line Graph

A line graph is a graph
used to show change
over time!!
What can time be measured in???
Seconds - Minutes - Hours – Days Weeks - Months – Years - Decades Centuries - etc.
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4
When to use a line graph?
Would we use a line graph
in the following situations:
•To show how many people like pizza in
this class? NO
•To show how much it rained each month
this year? YES- because months and years deal with time.
•To show how many people live in East
Meadow?
NO
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5
Birthdays?
Would we use a line graph to show
when our birthdays are?



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3/12/2016
Our birthday does deal with time
doesn’t it? (months/years)
But, our birthday is constant,
meaning it never changes.
A line graph shows change in time,
so we would not use it for this type
of graph.
6
How do we make a line
graph?


Y

X
3/12/2016
A line graph ALWAYS has a
title!
A line graph has two different
axis’s
An axis is either the horizontal
line (called x) or the vertical line
(called y) that form the base
lines of a graph.
7
YOU TELL ME….
What color is the y-axis?
Y
X
What color is the x-axis?
3/12/2016
8
X-axis and Y-axis




When you are making a line graph, the
x-axis is always horizontal, and the yaxis is always vertical.
The x and y-axis usually starts with zero
on a line graph
It is important to make sure that the
intervals on our y-axis are always equal.
What do I mean by this?
3/12/2016
9
Intervals


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3/12/2016
When we are setting up a line graph, we
need to decide what intervals we want to
use.
If we are graphing the temperature for a
year, do we want to put 365 days on the
graph, and 100 different temperatures?
When we see a horizontal flat line, that
means that there was no change during a
specific time period.
10
Plotting a Line graph



When we are plotting a line graph, it is
important to read what information is on
each axis.
There must be a label on each axis that
describes the information.
Much like a bar graph, we look at the x-axis
first in order to plot our points.
3/12/2016
Time in minutes
11
Is this an acceptable graph?
Car Trip
Time
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12
What information do you
need to interpret a graph?
Tripat does not
•The graph we just Car
looked
have any numbers on the x-axis or the yaxis.
•Can we still draw conclusions and
answer questions about that graph?
•How many times did the driver stop
Time
driving during the trip?
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13
Practice With Graphs
•Please study the graphs that
you have and answer the
questions.
•Then we will discuss the your
answers.
3/12/2016
14
Money spent this week
Amoutn of $
$25.00
$20.00
$15.00
$10.00
$5.00
$0.00
Mon.
Tues.
Wed.
Thurs.
Fri.
Day
3/12/2016
15
Q&A
Which
About day
howdid
much
thismoney
personinspend
total the
did
most
thismoney?
person spend
How do
onyou
Monday
know?
and
Thursday?
How
do
you
know?
This person spent the most money on
This
person
spent
about
$9.00
on
Wednesday. I know this because the
Monday
and
Thursday.
I
know
this
graph is the highest on Wednesday.
because I looked at where the line was
for Monday and Thursday and added
the two amounts.
3/12/2016
16
Miles Traveled
Miles traveled during the week
70
60
50
40
30
20
10
0
Mon.
Tues. Wed. Thurs.
Fri.
Sat.
Sun.
Days
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17
Q&A
How many days did this person travel
less than 30 miles? 5 days
Which day did the driver travel the
least amount of miles? Sunday
Why might someone want to keep
track of their miles for the week?
To figure out how much gas they
need a week.
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18
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
Acres of corn (in millions)
U.S. Corn in Acres
85
80
75
70
65
60
55
Years
3/12/2016
19
Q&A
About how much corn did the U.S.
have in 1991? About 77 million acres
What does the y-axis represent in the
graph? Acres of corn in millions.
Can you think of another title for
this graph? The rise and fall of corn
in the U.S.
3/12/2016
20
Calories burned while running
240
220
200
Calories
180
160
140
120
100
80
60
40
20
270
240
210
180
150
120
90
60
30
0
Hours
3/12/2016
21
Make your own…..
•Now that you have had time to
interpret graphs, I would like you
to make your own graphs.
•Remember to read the
information carefully and label
everything!
3/12/2016
22
Amount of Rain From Yesterday's Storm
Amount in Millileters
14
12
10
8
6
4
2
0
1PM
2PM
3PM
4PM
5PM
6PM
7PM
Time in Hours
3/12/2016
23
Calories burned while running
Calories
240
220
200
180
160
140
120
100
80
60
40
20
270
240
210
180
150
120
90
60
30
0
Hours
3/12/2016
24
Value of TY beanie baby "Slowpoke Sloth"
30
Value in Dollars
25
20
15
10
5
0
1996
1997
1998
1999
2000
2001
Year
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25
Do these have the same
information on them?
Test grades
Source
100
50
0
1
2
3
4
5
6
Week
Source
Test grades
90
85
80
75
70
1
3/12/2016
2
3
4
Week
5
6
26
Great Job!
3/12/2016
27