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Scatter Graphs & Correlation

CONCEPTUAL
MathematicsData & Statistics|Ages 13—14|ID: mt_8atyuvPUZc

Describe simple mathematical relationships between two variables using scatter graphs, identify positive, negative, or no correlation, and use a line of best fit to make predictions

Mastery Evidence

  • Plot bivariate data on a scatter graph and describe the type of correlation observed
  • Draw a line of best fit by eye and use it to estimate a value within the data range
  • Explain what positive, negative, and no correlation mean in the context of real data (e.g., temperature vs. ice-cream sales)

Assessment Prompt

“If [child] plotted a scatter graph — say, comparing hours of revision and test scores — could they draw a line of best fit, describe the pattern, and use it to make a prediction?”

Curriculum Standards4 alignments

8.SP.1Common Core State Standards for Mathematics
Scatter plots and association

Construct and interpret scatter plots for bivariate measurement data to investigate patterns of association between two quantities. Describe patterns such as clustering, outliers, positive or negative association, linear association, and nonlinear association.

SP
8.SP.2Common Core State Standards for Mathematics
Linear models for data

Know that straight lines are widely used to model relationships between two quantitative variables. For scatter plots that suggest a linear association, informally fit a straight line, and informally assess the model fit by judging the closeness of the data points to the line.

SP
8.SP.3Common Core State Standards for Mathematics
Interpreting linear models

Use the equation of a linear model to solve problems in the context of bivariate measurement data, interpreting the slope and intercept. For example, in a linear model for a biology experiment, interpret a slope of 1.5 cm/hr as meaning that an additional hour of sunlight each day is associated with an additional 1.5 cm in mature plant height.

SP
KS3.Maths.Stat.3The national curriculum in England
Bivariate Data and Scatter Graphs

describe simple mathematical relationships between 2 variables (bivariate data) in observational and experimental contexts and illustrate using scatter graphs

Mathematics · Key Stage 3

Prerequisites4

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