What is data? What are some examples of data you could collect?

Data is information that is collected. Answers will vary.

How do you plot data on a line plot?

I make a number line that shows the range of the data in my data set. Then I put a point above a number on the number line for each time that number appears in my data set.

Sarrie collected data from her classmates about how far their home is from school and how long it takes them to get to school. Could Sarrie plot this data on a line plot?

Sarrie could plot either the distances OR the times on a line plot. She couldn't plot both on the same line plot.

Do you know of any data displays where you can plot data that has two variables, like Sarrie's data?

No, all of the data displays I know only show one variable.

Why might someone want to show two-variable data in a data display?

They may want to figure out if the data have a relationship, like if being further from school means they take longer to get to school.

What are some examples of bivariate data you could collect?

It should be data where the information collected has two numeric values, such as height versus weight.

How can you plot bivariate data on a scatter plot?

Pick one variable to be on the x-axis. The other variable goes on the y-axis. Write a coordinate pair for each piece of data. Then plot each data point.

What does bivariate data look like when it shows a positive association?

In general, as the x-value increases, the y-value also increases.

What does bivariate data look like when it shows a negative association?

In general, as the x-value increases, the y-value decreases.

How can you draw a trend line through scatter plot data? How can you find an equation for that line?

I can draw a line that goes approximately through the middle of the data. To find the equation, I can use two points on the line to calculate the slope. I can also use a point and the slope, or look at the graph, to find the y-intercept. The equation is in the form y = mx + b.

Scatter Plots (Displaying Bivariate Data)

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What you will learn from this videoWhat you will learn

We'll learn how to display data using a scatter plot.
We’ll also learn that a scatter plot can show the relationship between two variables.
And we'll discover how this knowledge can help us sell ice cream, climb mountains, and even take care of a dog.

Discussion Questions
- Before Video
  What is data? What are some examples of data you could collect?ANSWER
  - Data is information that is collected. Answers will vary.
  How do you plot data on a line plot?ANSWER
  - I make a number line that shows the range of the data in my data set. Then I put a point above a number on the number line for each time that number appears in my data set.
  Sarrie collected data from her classmates about how far their home is from school and how long it takes them to get to school. Could Sarrie plot this data on a line plot?ANSWER
  - Sarrie could plot either the distances OR the times on a line plot. She couldn't plot both on the same line plot.
  Do you know of any data displays where you can plot data that has two variables, like Sarrie's data?ANSWER
  - No, all of the data displays I know only show one variable.
  Why might someone want to show two-variable data in a data display?ANSWER
  - They may want to figure out if the data have a relationship, like if being further from school means they take longer to get to school.
- After Video
  What are some examples of bivariate data you could collect?ANSWER
  - It should be data where the information collected has two numeric values, such as height versus weight.
  How can you plot bivariate data on a scatter plot?ANSWER
  - Pick one variable to be on the x-axis. The other variable goes on the y-axis. Write a coordinate pair for each piece of data. Then plot each data point.
  What does bivariate data look like when it shows a positive association?ANSWER
  - In general, as the x-value increases, the y-value also increases.
  What does bivariate data look like when it shows a negative association?ANSWER
  - In general, as the x-value increases, the y-value decreases.
  How can you draw a trend line through scatter plot data? How can you find an equation for that line?ANSWER
  - I can draw a line that goes approximately through the middle of the data. To find the equation, I can use two points on the line to calculate the slope. I can also use a point and the slope, or look at the graph, to find the y-intercept. The equation is in the form y = mx + b.
Vocabulary
- Line plot DEFINE
- Data DEFINE
- Bivariate data DEFINE
- Coordinate plane DEFINE
- Coordinate pair DEFINE
- Scatter plot DEFINE
- Positive association DEFINE
- Negative association DEFINE
- Outlier DEFINE
- Cluster DEFINE
Reading Material
Practice Word Problems
Practice Number Problems
Lesson Plan
Teacher Guide
Assessment
Online Quiz Game Quiz PDF Exit Ticket