NumicornNumicornLearn, solve, progress

Bivariate Data and Scatter Plots Practice Tests

These Grade 8 Math practice tests cover paired numerical data, scatter plots, positive and negative associations, trends, line of best fit, residuals, outliers, and predictions.

Skills covered

  • Reading ordered pairs, tables, domains, and ranges
  • Describing positive, negative, weak, strong, and no association
  • Interpreting clusters, outliers, trend lines, and residuals
  • Distinguishing interpolation, extrapolation, association, and causation
  • Using real-world data to make and evaluate predictions

How to use these practice tests

Read both axes and their units first. Then describe the direction and strength of the association, inspect unusual points, and use a trend line only within a reasonable data range.

For more Grade 8 Math practice, return to the Grade 8 Math category.

Select a test

5 Tests
1. Test2. Test3. Test4. Test5. Test

2. Test

Grade 8 Bivariate Data and Scatter Plots Practice Tests

Practice Grade 8 Math questions about bivariate data, scatter plots, associations, trend lines, residuals, outliers, predictions, and real-world contexts.

Choose the best answer for each question. Identify both variables, read the scale, describe the association, and distinguish association from causation.

10 Questions
0/10 Questions0 %
Correct 0
Incorrect 0
Unanswered 10
1. QuestionMultiple choice

A scatter plot rises from left to right in a fairly straight pattern. What association does it show?

Please select an answer first.

Correct answer: A

The correct answer is Positive linear association.

  1. Identify the two variables: Name the input and output variables and read each ordered pair, table, or graph carefully.
  2. Analyze the association: As x increases, y tends to increase, creating a positive linear pattern.
  3. Check the prediction: Decide whether the conclusion is interpolation, extrapolation, association, causation, or an observation about an outlier.

As x increases, y tends to increase, creating a positive linear pattern.

2. QuestionMultiple choice

A scatter plot falls from left to right in a fairly straight pattern. What association does it show?

Please select an answer first.

Correct answer: B

The correct answer is Negative linear association.

  1. Identify the two variables: Name the input and output variables and read each ordered pair, table, or graph carefully.
  2. Analyze the association: As x increases, y tends to decrease, creating a negative linear pattern.
  3. Check the prediction: Decide whether the conclusion is interpolation, extrapolation, association, causation, or an observation about an outlier.

As x increases, y tends to decrease, creating a negative linear pattern.

3. QuestionMultiple choice

The points in a scatter plot are spread randomly with no visible trend. What does this suggest?

Please select an answer first.

Correct answer: C

The correct answer is Little or no association.

  1. Identify the two variables: Name the input and output variables and read each ordered pair, table, or graph carefully.
  2. Analyze the association: A random cloud with no direction suggests little or no association.
  3. Check the prediction: Decide whether the conclusion is interpolation, extrapolation, association, causation, or an observation about an outlier.

A random cloud with no direction suggests little or no association.

4. QuestionMultiple choice

In a scatter plot, points lie close to a downward-sloping line. What is the association?

Please select an answer first.

Correct answer: D

The correct answer is Strong negative association.

  1. Identify the two variables: Name the input and output variables and read each ordered pair, table, or graph carefully.
  2. Analyze the association: The downward direction is negative, and points close to the line indicate a strong relationship.
  3. Check the prediction: Decide whether the conclusion is interpolation, extrapolation, association, causation, or an observation about an outlier.

The downward direction is negative, and points close to the line indicate a strong relationship.

5. QuestionMultiple choice

Which scatter plot would show a strong positive association?

Please select an answer first.

Correct answer: A

The correct answer is Points close to an upward-sloping line.

  1. Identify the two variables: Name the input and output variables and read each ordered pair, table, or graph carefully.
  2. Analyze the association: A strong positive association has little spread around an increasing trend.
  3. Check the prediction: Decide whether the conclusion is interpolation, extrapolation, association, causation, or an observation about an outlier.

A strong positive association has little spread around an increasing trend.

6. QuestionMultiple choice

A scatter plot shows that as outside temperature rises, lemonade sales tend to rise. What type of association is this?

Please select an answer first.

Correct answer: B

The correct answer is Positive association.

  1. Identify the two variables: Name the input and output variables and read each ordered pair, table, or graph carefully.
  2. Analyze the association: Both variables tend to increase together.
  3. Check the prediction: Decide whether the conclusion is interpolation, extrapolation, association, causation, or an observation about an outlier.

Both variables tend to increase together.

7. QuestionMultiple choice

A scatter plot has points close to a horizontal line. What does this suggest about y?

Please select an answer first.

Correct answer: C

The correct answer is The y-values change little as x changes..

  1. Identify the two variables: Name the input and output variables and read each ordered pair, table, or graph carefully.
  2. Analyze the association: A horizontal trend means the output stays nearly constant while the input changes.
  3. Check the prediction: Decide whether the conclusion is interpolation, extrapolation, association, causation, or an observation about an outlier.

A horizontal trend means the output stays nearly constant while the input changes.

8. QuestionMultiple choice

Which statement best describes a strong association?

Please select an answer first.

Correct answer: D

The correct answer is The points follow a clear pattern with little spread..

  1. Identify the two variables: Name the input and output variables and read each ordered pair, table, or graph carefully.
  2. Analyze the association: Strength describes how closely the points follow a visible pattern.
  3. Check the prediction: Decide whether the conclusion is interpolation, extrapolation, association, causation, or an observation about an outlier.

Strength describes how closely the points follow a visible pattern.

9. QuestionMultiple choice

A plot of age and reading level rises, but points are widely scattered. What is the best description?

Please select an answer first.

Correct answer: A

The correct answer is A weak positive association.

  1. Identify the two variables: Name the input and output variables and read each ordered pair, table, or graph carefully.
  2. Analyze the association: The upward trend is positive, but the wide spread makes it weak.
  3. Check the prediction: Decide whether the conclusion is interpolation, extrapolation, association, causation, or an observation about an outlier.

The upward trend is positive, but the wide spread makes it weak.

10. QuestionMultiple choice

What does a negative association mean?

Please select an answer first.

Correct answer: B

The correct answer is Larger x-values tend to be paired with smaller y-values..

  1. Identify the two variables: Name the input and output variables and read each ordered pair, table, or graph carefully.
  2. Analyze the association: Negative association describes a tendency for one variable to decrease as the other increases.
  3. Check the prediction: Decide whether the conclusion is interpolation, extrapolation, association, causation, or an observation about an outlier.

Negative association describes a tendency for one variable to decrease as the other increases.

Previous testNext test