6 4 Bar Graphs Learn to display and

6 -4 Bar Graphs Learn to display and analyze data in bar graphs.

6 -4 Bar Graphs Vocabulary bar graph double-bar graph

6 -4 Bar Graphs A bar graph can be used to display and compare data. A bar graph displays data with vertical or horizontal bars.

6 -4 Bar Graphs Additional Example 1 A: Reading a Bar Graph Use the bar graph to answer each question. Which biome in the graph has the least average summer temperature? Find the lowest bar. The coniferous forest has the least average summer temperature.

6 -4 Bar Graphs Additional Example 1 B: Reading a Bar Graph Use the bar graph to answer each question. Which biomes in the graph have an average summer temperature of 30 C or greater? Find the bar or bars whose heights measure 30 or more than 30. The grassland the rain forest have average summer temperatures of 30 C or greater.

6 -4 Bar Graphs Check It Out: Example 1 A Use the bar graph to answer each question. Which biome in the graph has the highest average summer temperature? Find the highest bar. The rain forest has the highest average summer temperature.

6 -4 Bar Graphs Check It Out: Example 1 B Use the bar graph to answer each question. Which biomes in the graph have an average summer temperature of 25 C or greater? Find the bar or bars whose heights measure 25 or more than 25. The deciduous forest, the grassland, and the rain forest have average summer temperatures of 25 C or greater.

6 -4 Bar Graphs Additional Example 2: Making a Bar Graph Use the data to make a bar graph. Step 1: Find an appropriate scale and interval. The scale must include all of the data values. The interval separates the scale into equal parts. Step 2: Use the data to determine the lengths of the bars. Draw bars of equal width. The bars cannot touch. Step 3: Title the graph and label the axes. Magazine Subscriptions Sold Grade 6 Grade 7 Grade 8 258 597 374

6 -4 Bar Graphs Check It Out: Example 2 Use the data to make a bar graph. Step 3: Title the graph and label the axes. Tickets Sold Grade 6 Grade 7 Grade 8 310 215 285 Tickets Sold Tickets Step 1: Find an appropriate scale and interval. The scale must include all of the data values. The interval separates the scale into equal parts. Step 2: Use the data to determine the lengths of the bars. Draw bars of equal width. The bars cannot touch. Grade 6 Grade 7 Grade 8

6 -4 Bar Graphs A double-bar graph shows two sets of related data.

6 -4 Bar Graphs Additional Example 3: Problem Solving Application Make a double-bar graph to compare the data in the table. Club Memberships 1 Club Art Music Science Boys 12 6 16 Girls 8 14 4 Understand the Problem You are asked to use a graph to compare the data given in the table. You will need to use all of the information given.

6 -4 Bar Graphs Additional Example 3 Continued 2 Make a Plan You can make a double-bar graph to display the two sets of data.

6 -4 Bar Graphs Additional Example 3 Continued 3 Solve Determine appropriate scales for both sets of data. Use the data to determine the lengths of the bars. Draw bars of equal width. Bars should be in pairs. Use a different color for boy memberships and girl memberships. Title the graph and label both axes. Include a key to show what each bar represents.

6 -4 Bar Graphs Additional Example 3 Continued 4 Look Back You could make two separate graphs, one of boy memberships and one of girl memberships. However, it is easier to compare the two data sets when they are on the same graph.

6 -4 Bar Graphs Check It Out: Example 3 Make a double-bar graph to compare the data in the table. Club Memberships 1 Club Band Chess Year Book Boys 9 14 16 Girls 11 7 15 Understand the Problem You are asked to use a graph to compare the data given in the table. You will need to use all of the information given.

6 -4 Bar Graphs Check It Out: Example 3 2 Make a Plan You can make a double-bar graph to display the two sets of data.

6 -4 Bar Graphs Check It Out: Example 3 Continued 3 Solve Memberships Club Determine appropriate scales for both sets of data. Use the data to determine the lengths of the bars. Draw bars of equal width. Bars should be in pairs. Use a different color for boy memberships and girl memberships. Title the graph and label both axes. Include a key to show what each bar represents.

6 -4 Bar Graphs Check It Out: Example 3 Continued 4 Look Back You could make two separate graphs, one of boy memberships and one of girl memberships. However, it is easier to compare the two data sets when they are on the same graph.

6 -4 Bar Graphs Lesson Quiz: Part 1 Use the bar graph to answer each question. Student Pet Survey 1. Which animal was least popular among students? bird 2. Which pet was more popular to twice as many students as rabbits were? dog

6 -4 Bar Graphs Lesson Quiz: Part 2 3. Make a bar graph of this data. Number of Daily Servings Grains = 6 Fruit = 2 Meat = 2 Milk = 3 Vegetables = 3