Grade 8 Scatter Plots Worksheet

Grade 8: Scatter Plots

Read each question carefully and provide your best answer. For graphing questions, plot the points accurately and draw lines of best fit where indicated.

1. Which type of association is shown in a scatter plot where as one variable increases, the other variable also increases?

2. An outlier in a scatter plot is a data point that:

3. A scatter plot is a graph that shows the relationship between two sets of  .

4. When creating a scatter plot, the independent variable is usually plotted on the  -axis.

5. A line of best fit is also known as a   line.

6. A strong correlation in a scatter plot always means that one variable causes the other.

7. A scatter plot with points randomly spread out indicates a strong positive association.

8. Plot the following data points on the graph below. Then, describe the association (positive, negative, or no association) and draw a line of best fit.

Data: (1, 2), (2, 4), (3, 3), (4, 5), (5, 6), (6, 5), (7, 7)

Description of Association:  

9. The scatter plot below shows the relationship between the number of hours spent studying for a test and the score received on the test.

Based on the scatter plot, what type of association (positive, negative, or no association) exists between hours studied and test scores? Explain your reasoning.

10. Explain what a line of best fit represents in a scatter plot and how it can be used to make predictions. Provide an example.