BAR AND LINE GRAPHS A VISUAL REPRESENTATION OF DATA.

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Presentation transcript:

BAR AND LINE GRAPHS A VISUAL REPRESENTATION OF DATA

VOCABULARY Bar Graph - A graph using bars to compare quantities. The height or length of each bar represents a designated number. (A bar graph is used to compare the frequency of the amount in a category.)

400 parents with children under 18 were surveyed to see how they wake up their children. The results are shown in the bar graph below.

VOCABULARY Line Graph - A graph used to show change and direction of change over a period of time.

Brandon took a poll to see how many soft drinks his classmates drank each day of the week. When do students drink the most soft drinks? Which day do they drink least amount?

Vocabulary Scale: The set of all possible values in a set of data including the least and greatest numbers in the set. Once you determine the scale for the set of data, then you can group the data in intervals.

Vocabulary Interval: The difference between successive values on a scale. For example: When Brandon polled his classmates, he got the following data about how many soft drinks they drank Monday through Sunday: 27, 22, 18, 26, 57, 61 & 42.

Finding the Scale for Your Data Find the smallest and largest numbers in the set of data to determine the scale. In this example, the smallest number is 18 and the largest is 61, so we can set our scale from 0 to 70. That scale will include all values in our set of data.

Choosing Intervals The scale of 0 to 70 includes all data. Now we need to determine what the intervals on the scale will be by dividing the scale into equal groups. In this example, we could use intervals of 10. This means each line on the graph represents 10 sodas. (The values increase in intervals of 10.) Let’s look at the graph again.

Brandon took a poll to see how many soft drinks his classmates drank each day of the week. When do students drink the most soft drinks? Which day do they drink least amount?