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High School Algebra I: Help and Review25 chapters | 292 lessons

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Lesson Transcript

Instructor:
*Cory Haley*

We will explore the function and examples of a double line graph. In this lesson, you will also learn to create questions and interpret data from a double line graph.

First, let's review what is a line graph? A **line graph** is a graphical display of information that shows a continuous change. The lines in a line graph can ascend and descend based on the data. Within a line graph the data points connect. We can use line graphs to show a comparison with events, situations, and information. A line graph may also be referred to as a line chart.

A **double line graph** is a line graph with two lines connecting points to show a continuous change. Just like a line graph, the lines can ascend and descend in a double line graph. A double line graph has two axes. The **x-axis** of a double line graph shows the occurrences and the categories being compared over time, and the **y-axis** represents the scale. A **scale** is a set of numbers that represents the data and is organized into equal intervals. A double line graph must have a **title**, which provides a general overview of what is being displayed. A double line graph will also include a **key**, which represents the information, event, and situation being observed.

Let's look at an example. The first step in creating a double line graph is to provide a title for the double line graph. The title of this double line graph is 'Average Snow Fall.'

Second, draw and label the two axes: the y-axis, which is the scale with equal intervals and ranging from 0-4, and the x-axis, which is the specific category observing the continuous change in the data. The y-axis has the label of 'Inches,' and the x-axis has the label of 'Months.'

Third, draw the double lines to show the data continuously changing over the observed time period. Finally, provide a key. The key for this double line graph represents the two cities that are being compared.

Hey, did you know with a double line graph we can create and answer questions based on the data being displayed? Check out this scenario! You are in charge of planning activities for a school festival and are trying to find the best time for outdoor and indoor activities based on the temperature. Take a moment and look at the double line graph.

Our first question could be, what is being observed? The correct response is the temperature over an eight hour time period. Based on the graph, what is the highest indoor activity's temperature? The correct response is 70 degrees Fahrenheit. Great you are on your way of becoming a great data analyst! Here is another question. At what time of the day for the outdoor activities was the temperatures were below 65 degrees Fahrenheit? The correct response is 9:00 A.M. The data on this graph can be use to make decisions when planning for activities based on the temperature.

In this lesson, we defined a **double line graph** as a line graph with two lines that connect points to show a continuous change, and we explored the features, functions, and examples of a double line graph. We learned that we can use a double line graph when comparing two sets of data. Also, we learned that a double line graph has a key, two axes, a scale, double lines that can ascend or descend, and a title. Finally, this lesson showed you an example of why a double line graph is useful for recording and interpreting data in order to make decisions.

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High School Algebra I: Help and Review25 chapters | 292 lessons

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