Grade 8 · Data · Interactive practice

Scatter Plot Practice

Practise identifying variables, relationships, and responsible conclusions. Work through all three problems and use the feedback to improve your strategy.

All 3 questions

Which question requires two-variable data?

Choose an answer, then check your thinking.

View every question and worked answer

Which question requires two-variable data?

Answer: Is arm span related to height?

Each person needs both an arm-span value and a height value.
Points rise closely from lower left to upper right. How should the relationship be described?

Answer: strong positive

A close upward pattern indicates a strong positive relationship.
A scatter plot shows exercise time and mood score rising together. What can be concluded directly?

Answer: The variables have a positive association

The plot supports association, but it does not by itself prove causation.

For parents and educators

Ontario curriculum alignment

Grade 8 Mathematics · Strand D: Data

View supported expectations

D1.1 · Data Collection and Organization

Identify situations involving one-variable data and situations involving two-variable data, and explain when each type is needed.
D1.3 · Data Visualization

Select a suitable graph, including a scatter plot, display data with proper sources, titles, labels, and scales, and justify the choice.
D1.5 · Data Analysis

Use mathematical language including strong, weak, none, positive, and negative to describe relationships between two variables with and without outliers.
D1.6 · Data Analysis

Analyse data in scatter plots and misleading graphs, challenge preconceived notions, draw conclusions, and make convincing arguments and informed decisions.