DoubleDoubleBar GraphsBar Graphs

Bar GraphBar Graph

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A bar graph can A bar graph can be used to be used to display and display and compare datacompare data

The scale The scale should include should include all the data all the data values and be values and be easily divided easily divided into equal into equal intervals.intervals.

How to interpret a Bar GraphHow to interpret a Bar Graph??

How many of How many of Mrs. Handley’s Mrs. Handley’s students are students are band members?band members?

How many of How many of Mrs. Handley’s Mrs. Handley’s students are not students are not band members?band members?

The bar graph shows Mrs. Handley’s The bar graph shows Mrs. Handley’s students by gender and band students by gender and band

membershipmembership..

Double Bar GraphDouble Bar Graph

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1stQtr

2ndQtr

3rdQtr

4thQtr

Can be used to Can be used to compare two compare two related sets of related sets of datadata

How to make a Double-Bar How to make a Double-Bar GraphGraph??

Choose a scale and interval Choose a scale and interval for the vertical axis.for the vertical axis.

Draw a pair of bars for each Draw a pair of bars for each set of data. Use different set of data. Use different colors to show two sets of colors to show two sets of data.data.

Label the axLabel the axees and give the s and give the graph a titlegraph a title..

Make a key to show what Make a key to show what each bar represents.each bar represents.

The table shows the highway The table shows the highway speed limits on interstate roads speed limits on interstate roads

within three stateswithin three states

StateStateUrbanUrbanRuralRural

FloridaFlorida65 mph65 mph70 mph70 mph

TexasTexas70 mph70 mph70 mph70 mph

VermontVermont55 mph55 mph65 mph65 mph

Step 1Step 1

Choose a scale Choose a scale and interval for the and interval for the vertical axis.vertical axis.

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StateStateUrbanUrbanRuralRural

FloridaFlorida65 mph65 mph70 mph70 mph

TexasTexas70 mph70 mph70 mph70 mph

VermontVermont55 mph55 mph65 mph65 mph

Step 2Step 2 Draw a pair of bars for each Draw a pair of bars for each

state’s data. Use different state’s data. Use different colors to show urban and rural.colors to show urban and rural.

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Florida Texas Vermont

StateStateUrbanUrbanRuralRuralFloridaFlorida65 mph65 mph70 mph70 mph

TexasTexas70 mph70 mph70 mph70 mph

VermontVermont55 mph55 mph65 mph65 mph

Step 3 and 4Step 3 and 4

Label the axes and Label the axes and give the graph a give the graph a title.title.

Make a key to Make a key to show what each show what each bar representsbar represents

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Florida Texas Vermont

Spe

ed L

imit

(mi/h

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Urban

Rural

Speed Limit on Interstate Roads

Can you now make double Can you now make double bar Graphbar Graph??

The list below shows the results ofThe list below shows the results of

two tests taken by students in two tests taken by students in Mrs. Handley’s Math Class.Mrs. Handley’s Math Class.

NameTest OneTest Two

Tom7285

Jessica8095

Ralph6298

Lucy85100

The endThe end