objectives construct a line graph from a set of data. analyze a line graph for trends or patterns,...

ObjectivesConstruct a line graph from a set of data.Analyze a line graph for trends or patterns, and

make predictions about data.

What is the difference between bar graphs and

line graphs?

Bar GraphsBar graphs are used to show amounts of data.How much? How many?Example – the amount of each color of candy in a

bag.

Line GraphsLine graphs connect

points to show change in data over time.

Months, hours, minutes, days, weeks, years, seconds, etc.

Which graph would we use?

Bar Graph Line Graph

the height of a plant as it grows

how many people like each kind of ice

cream

how much money each store in a mall makestemperature over

the week

Victoria’s HeightSuppose we want to make

a graph of Victoria’s height as she grew older.

What type of graph should we use? Why?

AgeHeight

(inches)

2 35

4 40

6 45

8 50

10 55

Line GraphsA line graph would be a good way to show how

something has changed over time.

Parts of a Line Graph

Line Graphs The table below shows

daily temperatures for New York City, recorded for 6 days, in degrees Fahrenheit

Line Graphs Sarah bought a new car in

2001 for $24,000. The dollar value of her car changed each year as shown in the table below.

Line GraphsThe table below shows

Sam's weight in kilograms for 5 months.

How can a line graph be used?View trends or patterns in data.

Does it seems to be increasing, decreasing, staying the same, or does it have no pattern at all?

How can a line graph be used?Make predictions

about data.What do you predict

will happen to the temperature over the next few days?

How can a line graph be used?Tracking

global warming

How can a line graph be used?Carbon

Dioxide in the atmosphere

How to Create a Line GraphStep 1: Gather Data

AgeHeight

(inches)

2 35

4 40

6 45

8 50

10 55

How to Create a Line GraphStep 2: Label each axis.

AgeHeight

(inches)

2 35

4 40

6 45

8 50

10 55

How to Create a Line GraphStep 3: Chart the data.

AgeHeight

(inches)

2 35

4 40

6 45

8 50

10 55

How to Create a Line GraphStep 4:Connect the dots!

AgeHeight

(inches)

2 35

4 40

6 45

8 50

10 55

How to Create a Line GraphStep 5: Add a title.

AgeHeight

(inches)

2 35

4 40

6 45

8 50

10 55

Make a Line Graph!Movie ticket prices in the U.S.

Year Price

1956 $0.50

1966 $1.00

1976 $2.25

1986 $3.75

1996 $4.50

Your turn! Here is the data for the height of a tree over several years.Step 1: Gather data.Step 2: Label each axis.Step 3: Chart the data.Step 4: Connect the dots.Step 5: Add a title.

What do you predict the tree’s height will be in 2010?

YearHeight (in

feet)

2002 2

2004 4

2006 8

2008 14

2010 22

Your turn!Begin graphing the morning and afternoon

temperature for this past week.Step 1: Gather data.Step 2: Label each axis.Step 3: Chart the data.Step 4: Connect the dots.Step 5: Add a title.

What do you predict will happen to the temperature over the rest of the week?

Can you…Construct a line graph from a set of data?Analyze a line graph for trends or patterns, and

make predictions about data?