Graphing Data

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

Line Graphs Line 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 how many people like each kind of ice cream the height of a plant as it grows temperature over the week how much money each store in a mall makes

Victoria’s Height Age Height (inches) 2 35 4 40 6 45 8 50 10 55 Suppose we want to make a graph of Victoria’s height as she grew older. What type of graph should we use? Why?

Line Graphs A 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 Graphs The 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 Graph Step 1: Gather Data Age Height (inches) 2 35 4 40 6 45 8 50 10 55

How to Create a Line Graph Step 2: Label each axis. Age Height (inches) 2 35 4 40 6 45 8 50 10 55

How to Create a Line Graph Step 3: Chart the data. Age Height (inches) 2 35 4 40 6 45 8 50 10 55

How to Create a Line Graph Step 4:Connect the dots! Age Height (inches) 2 35 4 40 6 45 8 50 10 55

How to Create a Line Graph Step 5: Add a title. Age Height (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? Year Height (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?