A bar graph displays data with vertical or horizontal bars

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Presentation transcript:

A bar graph displays data with vertical or horizontal bars A bar graph displays data with vertical or horizontal bars. Bar graphs are a good way to display data that can be organized into categories. Using a bar graph, you can quickly compare the categories. A line graph displays data using line segments. Line graphs are a good way to display data that changes over a period of time. A circle graph shows parts of a whole. The entire circle represents 100% of the data and each sector represents a percent of the total. Circle graphs are good for comparing each category of data to the whole set.

Example 5: Reading and Interpreting Circle Graphs Use the graph to answer the question. 12.5% 12.5% 50% 25% Which ingredients are present in equal amounts? Lemon sherbet and pineapple juice. Look for same sized sectors.

The sections of a circle graph are called sectors. Reading Math

Example 6B: Choosing and Creating an Appropriate Display Use the given data to make a graph. Explain why you choose that type of graph. Degrees Held by Faculty A circle graph is good for displaying categories that make up a whole. Step 1 Calculate the percent of total represented by each category. Bachelor's: PhD: Master's:

Example 6B Continued Step 2 Find the angle measure for each sector of the graph. Since there are 360° in a circle, multiply each percent by 360°. PhD: 0.10  360° = 36° Master’s: 0.39  360° = 140.4° Bachelor’s: 0.51  360° = 183.6°

Example 6B Continued Step 3 Use a compass to draw a circle. Mark the center and use a straightedge to draw one radius. Then use a protractor to draw each central angle. Step 4 Title the graph and label each sector.

Example 6C: Choosing and Creating an Appropriate Display Use the given data to make a graph. Explain why you choose that type of graph. A line graph is appropriate for this data because it will show the change over time. County Farms 248 Step 1 Determine the scale and interval for each set of data. Time should be plotted on the horizontal axis because it is independent.

Lesson Quiz: Part II 4. The table shows how many orders were placed for each type of muffin at a bakery in one week. Use the data to make a graph. Explain why you chose that type of graph. A circle graph is used to compare each type of muffin to total muffin orders.